Massively parallel pyrosequencing of the mitochondrial genome with the 454 methodology in forensic genetics
Abstract
Results of sequencing of whole mitochondrial genome, HV1 and HV2 DNA with the second generation system (SGS) Roche 454 GS Junior were compared with results of Sanger sequencing and SNP typing with SNaPshot single base extension detected with MALDI-TOF and capillary electrophoresis. We investigated the performance of the software analysis of the data, reproducibility, ability to sequence homopolymeric regions, detection of mixtures and heteroplasmy as well as the implications of the depth of coverage. We found full reproducibility between samples sequenced twice with SGS. We found close to full concordance between the mtDNA sequences of 26 samples obtained with (1) the 454 SGS method using a depth of coverage above 100 and (2) Sanger sequencing and SNP typing. The discrepancies were primarily observed in homopolymeric regions. The 454 SGS method was able to sequence 95% of the reads correctly in homopolymers up to 4 bases, and up to 6 bases could be sequenced with similar success if the results were carefully, visually inspected. The 454 technology was able to detect mixtures or heteroplasmy of approximately 10%. We detected previously unreported heteroplasmy in the GM9947A component of the NIST human mitochondrial DNA SRM-2392 standard reference material.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Different NGS platforms, such as Roche/454, Ion torrent and Illumina systems, have proven capable of sequencing the majority of STR loci in forensic science.
“Different NGS platforms, such as Roche/454, Ion torrent and Illumina systems, have proven capable of sequencing the majority of STR loci in forensic science (Fordyce et al., 2015; Mikkelsen et al., 2014; Van Neste et al., 2014).”
From Short tandem repeat profiling via next-generation sequencing for cell line authentication (2023) · cites this paper as Mikkelsen et al., 2014
STR-CE has a stutter ratio of 20%, which is often used for initial filtering.
“compared to a stutter ratio of 20% for STR-CE, which is often used for initial filtering (Brookes et al., 2012; Mikkelsen et al., 2014; Novroski et al., 2016).”
From Short tandem repeat profiling via next-generation sequencing for cell line authentication (2023) · cites this paper as Mikkelsen et al., 2014
Cites
Sequencing technologies – the next generation
Metzker, M. L. (2010) · Nature Reviews Genetics · doi:10.1038/nrg2626 · Cited by 7,066 · see citing works
Reanalysis and revision of the Cambridge reference sequence for human mitochondrial DNA
Andrews, R. M., Kubacka, I., Chinnery, P. F., Lightowlers, R. N., Turnbull, D. M., & Howell, N. (1999) · Nature Genetics · doi:10.1038/13779 · Cited by 3,337 · see citing works
Updated comprehensive phylogenetic tree of global human mitochondrial DNA variation
van Oven, M., & Kayser, M. (2009) · Human Mutation · doi:10.1002/humu.20921 · Cited by 1,810 · see citing works
Identification of the remains of the Romanov family by DNA analysis
Gill, P., Ivanov, P. L., Kimpton, C., Piercy, R., Benson, N., Tully, G., Evett, I., Hagelberg, E., & Sullivan, K. (1994) · Nature Genetics · doi:10.1038/ng0294-130 · Cited by 693 · see citing works
The application of molecular genetic approaches to the study of human evolution
Cavalli-Sforza, L. L., & Feldman, M. W. (2003) · Nature Genetics · doi:10.1038/ng1113 · Cited by 671 · see citing works
Ivanov, P. L., Wadhams, M. J., Roby, R. K., Holland, M. M., Weedn, V. W., & Parsons, T. J. (1996) · Nature Genetics · doi:10.1038/ng0496-417 · Cited by 348 · see citing works
Carracedo, Á., Bär, W., Lincoln, P. J., Mayr, W. R., Morling, N., Olaisen, B., Schneider, P. M., Budowle, B., Brinkmann, B., Gill, P., et al. (2000) · Forensic Science International · doi:10.1016/s0379-0738(00)00161-4 · Cited by 329 · see citing works
Self-citationThe expanding scope of DNA sequencing
Shendure, J., & Aiden, E. L. (2012) · Nature Biotechnology · doi:10.1038/nbt.2421 · Cited by 300 · see citing works
Coble, M. D., Just, R. S., O’Callaghan, J. E., Letmanyi, I. H., Peterson, C. T., Irwin, J. A., & Parsons, T. J. (2004) · International Journal of Legal Medicine · doi:10.1007/s00414-004-0427-6 · Cited by 238 · see citing works
Parson, W., Strobl, C., Huber, G. E., Zimmermann, B., Gomes, S. M., Souto, L., Fendt, L., Delport, R., Langit, R., Wootton, S., et al. (2013) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2013.06.003 · Cited by 192 · see citing works
Mystery Solved: The Identification of the Two Missing Romanov Children Using DNA Analysis
Coble, M. D., Loreille, O. M., Wadhams, M. J., Edson, S. M., Maynard, K., Meyer, C. E., Niederstätter, H., Berger, C., Berger, B., Falsetti, A. B., et al. (2009) · PLoS ONE · doi:10.1371/journal.pone.0004838 · Cited by 186 · see citing works
Irwin, J. A., Saunier, J. L., Niederstätter, H., Strouss, K. M., Sturk‐Andreaggi, K., Diegoli, T. M., Kloss‐Brandstätter, A., Parson, W., & Parsons, T. J. (2009) · Journal of Molecular Evolution · doi:10.1007/s00239-009-9227-4 · Cited by 180 · see citing works
Extended guidelines for mtDNA typing of population data in forensic science
Parson, W., & Bandelt, H. (2007) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2006.11.003 · Cited by 157 · see citing works
Niederstätter, H., Köchl, S., Grubwieser, P., Pavlic, M., Steinlechner, M., & Parson, W. (2007) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2006.10.007 · Cited by 121 · see citing works
B�r, W., Brinkmann, B., Budowle, B., Carracedo, Á., Gill, P., Holland, M., Lincoln, P. J., Mayr, W. R., Morling, N., Olaisen, B., et al. (2000) · International Journal of Legal Medicine · doi:10.1007/s004140000149 · Cited by 121 · see citing works
Self-citationHolland, M. M., McQuillan, M. R., & O’Hanlon, K. A. (2011) · Croatian Medical Journal · doi:10.3325/cmj.2011.52.299 · Cited by 110 · see citing works
Fordyce, S. L., Ávila‐Arcos, M. C., Rockenbauer, E., Børsting, C., Frank-Hansen, R., Petersen, F. T., Willerslev, E., Hansen, A. J., Morling, N., & Gilbert, M. T. P. (2011) · BioTechniques · doi:10.2144/000113721 · Cited by 108 · see citing works
Self-citationForensic STR analysis using massive parallel sequencing
Van Neste, C., Van Nieuwerburgh, F., Van Hoofstat, D., & Deforce, D. (2012) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2012.03.004 · Cited by 102 · see citing works
Kloss‐Brandstätter, A., Niederstätter, H., Pavlic, M., Grubwieser, P., & Parson, W. (2006) · Forensic Science International · doi:10.1016/j.forsciint.2006.05.006 · Cited by 98 · see citing works
Zaragoza, M. V., Fass, J., Diegoli, M., Lin, D., & Arbustini, E. (2010) · PLoS ONE · doi:10.1371/journal.pone.0012295 · Cited by 95 · see citing works
Current Next Generation Sequencing technology may not meet forensic standards
Bandelt, H., & Salas, A. (2011) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2011.04.004 · Cited by 65 · see citing works
mtGenome reference population databases and the future of forensic mtDNA analysis
Irwin, J. A., Parson, W., Coble, M. D., & Just, R. S. (2010) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2010.02.008 · Cited by 46 · see citing works
A third hypervariable region in the human mitochondrial D-loop.
Lutz, S., Weisser, H., Heizmann, J., & Pollak, S. (1997) · PubMed · Cited by 39 · see citing works
Loreille, O. M., Koshinsky, H. A., Fofanov, V. Y., & Irwin, J. A. (2011) · Forensic science international. Genetics supplement series · doi:10.1016/j.fsigss.2011.10.013 · Cited by 31 · see citing works
Levin, B. C., Holland, K. A., Hancock, D. K., Coble, M. D., Parsons, T. J., Kienker, L. J., Williams, D. W., Jones, M., & Richie, K. L. (2003) · Mitochondrion · doi:10.1016/s1567-7249(03)00010-2 · Cited by 28 · see citing works
Mitochondrial DNA HV1 and HV2 variation in Danes
Mikkelsen, M., Sørensen, E., Rasmussen, E. M., & Morling, N. (2009) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2009.07.007 · Cited by 22 · see citing works
Self-citationApplication of full mitochondrial genome sequencing using 454 GS FLX pyrosequencing
Mikkelsen, M., Rockenbauer, E., Wächter, A., Fendt, L., Zimmermann, B., Parson, W., Nielsen, S. C. A., Gilbert, M. T. P., Willerslev, E., & Morling, N. (2009) · Forensic science international. Genetics supplement series · doi:10.1016/j.fsigss.2009.09.028 · Cited by 22 · see citing works
Self-citationForensic and phylogeographic characterisation of mtDNA lineages from Somalia
Mikkelsen, M., Fendt, L., Röck, A. W., Zimmermann, B., Rockenbauer, E., Hansen, A. J., Parson, W., & Morling, N. (2012) · International Journal of Legal Medicine · doi:10.1007/s00414-012-0694-6 · Cited by 17 · see citing works
Self-citationBørsting, C., Tomàs, C., & Morling, N. (2011) · Methods in molecular biology · doi:10.1007/978-1-61779-461-2_7 · Cited by 6 · see citing works
Self-citationFrequencies of 33 coding region mitochondrial SNPs in a Danish and a Turkish population
Mikkelsen, M., Rockenbauer, E., Demir, H., Børsting, C., & Morling, N. (2010) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2010.08.001 · Cited by 3 · see citing works
Self-citation
Flagged first, then by citations
Cited by
Sorted by citations
Application of Next-Generation Sequencing Technology in Forensic Science
Yang, Y., Xie, B., & Yan, J. (2014) · Genomics Proteomics & Bioinformatics · doi:10.1016/j.gpb.2014.09.001 · Cited by 204 · see citing works
Massively parallel sequencing techniques for forensics: A review
Bruijns, B., Tiggelaar, R. M., & Gardeniers, H. J. G. E. (2018) · Electrophoresis · doi:10.1002/elps.201800082 · Cited by 204 · see citing works
King, J. L., LaRue, B., Novroski, N. M. M., Stoljarova, M., Seo, S. B., Zeng, X., Warshauer, D. H., Davis, C. P., Parson, W., Sajantila, A., et al. (2014) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2014.06.001 · Cited by 178 · see citing works
Massively parallel sequencing of complete mitochondrial genomes from hair shaft samples
Parson, W., Huber, G. E., Moreno, L. I., Madel, M., Brandhagen, M. D., Nagl, S., Xavier, C., Eduardoff, M., Callaghan, T., & Irwin, J. A. (2014) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2014.11.009 · Cited by 116 · see citing works
Xavier, C., & Parson, W. (2017) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2017.02.018 · Cited by 105 · see citing works
Just, R. S., Scheible, M. K. R., Fast, S. A., Sturk‐Andreaggi, K., Röck, A. W., Bush, J. M., Higginbotham, J. L., Peck, M. A., Ring, J. D., Huber, G. E., et al. (2014) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2014.09.021 · Cited by 97 · see citing works
Evaluation of the precision ID whole MtDNA genome panel for forensic analyses
Strobl, C., Eduardoff, M., Buś, M. M., Allen, M., & Parson, W. (2018) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2018.03.013 · Cited by 97 · see citing works
Single Nucleotide Polymorphism
Børsting, C., Pereira, V., Andersen, J. D., & Morling, N. (2014) · Wiley eBooks · doi:10.1002/9780470061589.fsa1113 · Cited by 84 · see citing works
Self-citationPeck, M. A., Sturk‐Andreaggi, K., Thomas, J. T., Oliver, R. S., Barritt-Ross, S., & Marshall, C. K. (2018) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2018.01.004 · Cited by 52 · see citing works
Peck, M. A., Brandhagen, M. D., Marshall, C. K., Diegoli, T. M., Irwin, J. A., & Sturk‐Andreaggi, K. (2016) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2016.06.003 · Cited by 51 · see citing works
Gomes, S. M., Bodner, M., Souto, L., Zimmermann, B., Huber, G. E., Strobl, C., Röck, A. W., Achilli, A., Olivieri, A., Torroni, A., et al. (2015) · BMC Genomics · doi:10.1186/s12864-014-1201-x · Cited by 48 · see citing works
Lindberg, M. R., Schmedes, S. E., Hewitt, F. C., Haas, J., Ternus, K. L., Kadavy, D. R., & Budowle, B. (2016) · PLoS ONE · doi:10.1371/journal.pone.0167600 · Cited by 46 · see citing works
Sturk‐Andreaggi, K., Parson, W., Allen, M., & Marshall, C. K. (2019) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2019.102205 · Cited by 42 · see citing works
Sequencing of mitochondrial genomes using the Precision ID mtDNA Whole Genome Panel
Pereira, V., Longobardi, A., & Børsting, C. (2018) · Electrophoresis · doi:10.1002/elps.201800088 · Cited by 36 · see citing works
Increasing the reach of forensic genetics with massively parallel sequencing
Budowle, B., Schmedes, S., & Wendt, F. (2017) · Forensic Science, Medicine, and Pathology · doi:10.1007/s12024-017-9882-5 · Cited by 30 · see citing works
Analysis of mixtures using next generation sequencing of mitochondrial DNA hypervariable regions
Kim, H., Erlich, H. A., & Calloway, C. (2015) · Croatian Medical Journal · doi:10.3325/cmj.2015.56.208 · Cited by 34 · see citing works
Comparative tolerance of two massively parallel sequencing systems to common PCR inhibitors
Elwick, K. E., Zeng, X., King, J. L., Budowle, B., & Hughes-Stamm, S. R. (2017) · International Journal of Legal Medicine · doi:10.1007/s00414-017-1693-4 · Cited by 34 · see citing works
Heteroplasmic Variants of Mitochondrial DNA in Atherosclerotic Lesions of Human Aortic Intima
Sobenin, I. A., Zhelankin, A. V., Khasanova, Z. B., Sinyov, V. V., Medvedeva, L. V., Sagaidak, M. O., Makeev, V. J., Kolmychkova, K. I., Smirnova, A. S., Sukhorukov, V. N., et al. (2019) · Biomolecules · doi:10.3390/biom9090455 · Cited by 29 · see citing works
Riman, S., Kiesler, K. M., Borsuk, L. A., & Vallone, P. M. (2017) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2017.04.005 · Cited by 27 · see citing works
Abicht, A., Scharf, F., Kleinle, S., Schön, U., Holinski‐Feder, E., Horváth, R., Benet‐Pagès, A., & Diebold, I. (2018) · Molecular Genetics & Genomic Medicine · doi:10.1002/mgg3.500 · Cited by 26 · see citing works
Skonieczna, K., Malyarchuk, B. А., Jawień, A., Marszałek, A., Banaszkiewicz, Z., Jarmocik, P., Borcz, M., Bała, P., & Grzybowski, T. (2014) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2014.10.021 · Cited by 26 · see citing works
Potential applications of nanopore sequencing for forensic analysis.
Hall, C. L., Zascavage, R. R., Sedlazeck, F. J., & Planz, J. V. (2020) · PubMed · Cited by 25 · see citing works
Lopopolo, M., Børsting, C., Pereira, V., & Morling, N. (2016) · American Journal of Physical Anthropology · doi:10.1002/ajpa.23074 · Cited by 22 · see citing works
Self-citationStephens, K., Barta, R., Fleming, K., Pérez, J. C., Wu, S., Snedecor, J., Holt, C., LaRue, B., & Budowle, B. (2023) · Forensic Science International: Genetics · doi:10.1016/j.fsigen.2023.102851 · Cited by 21 · see citing works
Searching the undetected mtDNA variants in forensic MPS data
Melchionda, F., Stanciu, F., Buscemi, L., Pesaresi, M., Tagliabracci, A., & Turchi, C. (2020) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2020.102399 · Cited by 17 · see citing works
Cho, S., Kim, M. Y., Lee, J. H., & Lee, S. D. (2017) · International Journal of Legal Medicine · doi:10.1007/s00414-017-1755-7 · Cited by 17 · see citing works
DNA Degradation: Current Knowledge and Progress in DNA Analysis
Ottoni, C., Bekaert, B., & Decorte, R. (2017) · Wiley eBooks · doi:10.1002/9781118953358.ch5 · Cited by 17 · see citing works
Results of a collaborative study on DNA identification of aged bone samples
Vaněk, D., Budowle, B., Dubska, J., Ambers, A., Frolík, J., Pospíšek, M., Afeefi, A. A. A., Hosani, K. I. A., Allen, M., Naimi, K. S. A., et al. (2017) · Croatian Medical Journal · doi:10.3325/cmj.2017.58.203 · Cited by 12 · see citing works
Haplotype diversity in mitochondrial genome in a Chinese Han population
Ma, K., Li, H., Cao, Y., Zhao, X., Liu, W., & Zhao, X. (2016) · Journal of Human Genetics · doi:10.1038/jhg.2016.74 · Cited by 11 · see citing works
Short tandem repeat profiling via next-generation sequencing for cell line authentication
Chen, Y.-H., Connelly, J. P., Florian, C., Cui, X., & Pruett-Miller, S. M. (2023) · Disease Models & Mechanisms · doi:10.1242/dmm.050150 · Cited by 9 · see citing works
“Different NGS platforms, such as Roche/454, Ion torrent and Illumina systems, have proven capable of sequencing the majority of STR loci in forensic science (Fordyce et al., 2015; Mikkelsen et al., 2014; Van Neste et al., 2014).”
Kim, M., Cho, S., Lee, J. H., Seo, H. J., & Lee, S. D. (2018) · Journal of Korean Medical Science · doi:10.3346/jkms.2018.33.e337 · Cited by 9 · see citing works
Validation of Expressmarker mtDNA‐SNP60: A mitochondrial SNP kit for forensic application
Zhang, C. Y., Li, H., Zhao, X., Ma, K., Nie, Y.-C., Liu, W., Jiao, H., & Zhou, H. (2016) · Electrophoresis · doi:10.1002/elps.201600042 · Cited by 9 · see citing works
Nakanishi, H., Fujii, K., Nakahara, H., Mizuno, N., Sekiguchi, K., Yoneyama, K., Hara, M., Takada, A., & Saito, K. (2019) · International Journal of Legal Medicine · doi:10.1007/s00414-019-02182-2 · Cited by 6 · see citing works
Andersen, J. D., Pereira, V., Pietroni, C., Mikkelsen, M., Johansen, P., Børsting, C., & Morling, N. (2014) · BioTechniques · doi:10.2144/000114200 · Cited by 5 · see citing works
Self-citationIn-Solution Hybridization for the Targeted Enrichment of the Whole Mitochondrial Genome
Bekaert, B., Ellerington, R., den Abbeele, L. V., & Decorte, R. (2016) · Methods in molecular biology · doi:10.1007/978-1-4939-3597-0_14 · Cited by 5 · see citing works
Mitochondrial genome sequencing with ForenSeq™ mtDNA Whole Genome Kit
Xuan, J., Long, G., Wu, H., Liu, Z., Zhang, B., Yu, S., Ren, F., & Guo, F. (2025) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2025.103274 · Cited by 4 · see citing works
Fujii, K., Mita, Y., Watahiki, H., Fukagawa, T., Kitayama, T., Mizuno, N., Nakahara, H., & Sekiguchi, K. (2022) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2022.102717 · Cited by 3 · see citing works
Probability of Mitochondrial DNA heteroplasmy in different tissues from European populations
Cuesta‐Aguirre, D. R., Onieva, A., Aluja, M. P., & dos Santos, C. M. P. (2026) · Mitochondrion · doi:10.1016/j.mito.2026.102117 · Cited by 2 · see citing works
Skonieczna, K., & Grzybowski, T. (2023) · Forensic Science International Genetics · doi:10.1016/j.fsigen.2023.102912 · Cited by 2 · see citing works
Next-Generation Sequencing Technologies and Plant Improvement
Afzal, F., Gul, A., & Kazi, A. M. (2016) · Springer eBooks · doi:10.1007/978-3-319-31703-8_11 · Cited by 1 · see citing works
Tools and techniques of using NGS platforms in forensic population genetic studies
Zhu, B., & Shen, C. (2024) · Elsevier eBooks · doi:10.1016/b978-0-323-99144-5.00026-3 · Cited by 1 · see citing works
Sequential Advancements of DNA Profiling: An Overview of Complete Arena
Nigam, K., Srivastava, A., Sahoo, S., Dubey, I. P., Tripathi, I. P., & Shrivastava, P. (2020) · Springer eBooks · doi:10.1007/978-981-15-6655-4_3
- Authors
- Mikkelsen, M., Frank-Hansen, R., Hansen, A. J., & Morling, N.
- Affiliations
- University of Copenhagen (DK)
- Corresponding author
- Mikkelsen, Martin
- Morling, Niels
- Venue
- Forensic Science International: Genetics
- Publisher
- Elsevier BV
- Published
- 2014-09
- Volume
- 12
- Pages
- 30-37
- ISSN
- 1872-4973 (ISSN-L)
- OpenAlex
- W2148342695
- Semantic Scholar
- 841ce7109ffd8efa915284f965ef5e96fa7cb86c
- Cited by
- 43
- References
- 30
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 1 · 2020: 3 · 2019: 3 · 2018: 6 · 2017: 8 · 2016: 7 · 2015: 2 · 2014: 7
- FWCI
- 5.24
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Forensic Science International Genetics (publishedVersion)
- PubMed (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Keywords
- mitochondrial DNA, pyrosequencing, forensic genetics, heteroplasmy, DNA mixtures, sequencing depth, reproducibility, Sanger sequencing comparison, mitochondrial DNA control region
- MeSH terms
- Base Sequence, DNA, Mitochondrial, Humans, Polymerase Chain Reaction, Sequence Analysis, DNA, DNA Primers, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization, Electrophoresis, Capillary, Polymorphism, Single Nucleotide, Forensic Genetics, Genome, Mitochondrial
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review