A review of studies on animal reservoirs of the SARS coronavirus
Open accessAbstract
In this review, we summarize the researches on animal reservoirs of the SARS coronavirus (SARS-CoV). Masked palm civets were suspected as the origin of the SARS outbreak in 2003 and was confirmed as the direct origin of SARS cases with mild symptom in 2004. Sequence analysis of the SARS-CoV-like virus in masked palm civets indicated that they were highly homologous to human SARS-CoV with nt identity over 99.6%, indicating the virus has not been circulating in the population of masked palm civets for a very long time. Alignment of 10 complete viral genome sequences from masked palm civets with those of human SARS-CoVs revealed 26 conserved single-nucleotide variations (SNVs) in the viruses from masked palm civets. These conserved SNVs were gradually lost from the genomes of viruses isolated from the early phase to late phase human patients of the 2003 SARS epidemic. In 2005, horseshoe bats were identified as the natural reservoir of a group of coronaviruses that are distantly related to SARS-CoV. The genome sequences of bat SARS-like coronavirus had about 88-92% nt identity with that of the SARS-CoV. The prevalence of antibodies and viral RNA in different bat species and the characteristics of the bat SARS-like coronavirus were elucidated. Apart from masked palm civets and bats, 29 other animal species had been tested for the SARS-CoV, and the results are summarized in this paper.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
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?
The proximal source of SARS-CoV was likely exotic animals in a live animal market in Guangdong, most probably palm civets and perhaps raccoon dogs.
“For example, the proximal source of SARS-CoV, the virus that led to the outbreak of severe acute respiratory syndrome in 2003–04, was likely to have been exotic animals in a live animal market in Guangdong, China—most probably palm civets (Paguma larvata) and perhaps raccoon dogs (Nyctereutes procyonoides).55”
From The Lancet Commission on lessons for the future from the COVID-19 pandemic (2022) · cites this paper as [55]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Cites
Angiotensin-converting enzyme 2 is a functional receptor for the SARS coronavirus
Li, W., Moore, M. J., Vasilieva, N., Sui, J., Wong, S. K., Berne, M. A., Somasundaran, M., Sullivan, J. L., Luzuriaga, K., Greenough, T. C., et al. (2003) · Nature · doi:10.1038/nature02145 · Cited by 5,923 · see citing works
Identification of a novel coronavirus in patients with severe acute respiratory syndrome
Drosten, C., Günther, S., Preiser, W., van der Werf, S., Brodt, H.-R., Becker, S., Rabenau, H., Panning, M., Kolesnikova, L., Fouchier, R. A. M., et al. (2003) · New England Journal of Medicine · doi:10.1056/nejmoa030747 · Cited by 4,574 · see citing works
A Novel Coronavirus Associated with Severe Acute Respiratory Syndrome
Tg, K., Erdman, D. D., Cs, G., Zaki, Peret, T. C. T., Emery, S. L., Tong, S., Urbani, C., Comer, J. A., Lim, W., et al. (2003) · New England Journal of Medicine · doi:10.1056/nejmoa030781 · Cited by 4,345 · see citing works
Coronavirus as a possible cause of severe acute respiratory syndrome
Peiris, M. J. S., Lai, S., Poon, L. L. M., Guan, Y., Yam, L., Lim, W., Nicholls, J. M., Yee, W., Yan, W., Cheung, M., et al. (2003) · The Lancet · doi:10.1016/s0140-6736(03)13077-2 · Cited by 2,916 · see citing works
Bats Are Natural Reservoirs of SARS-Like Coronaviruses
Li, W., Shi, Z., Yu, M., Ren, W., Smith, C. S., Epstein, J. H., Wang, H., Crameri, G. S., Hú, Z., Zhang, H., et al. (2005) · Science · doi:10.1126/science.1118391 · Cited by 2,571 · see citing works
Self-citationCharacterization of a Novel Coronavirus Associated with Severe Acute Respiratory Syndrome
Rota, P. A., Oberste, M. S., Monroe, S. S., Nix, W. A., Campagnoli, R. P., Icenogle, J. P., Peñaranda, S., Bankamp, B., Maher, K., Chen, M., et al. (2003) · Science · doi:10.1126/science.1085952 · Cited by 2,477 · see citing works
Guan, Y., Zheng, B., He, Y., Liu, X. L., Zhuang, Z. X., Cheung, C. L., Luo, S., Li, P. H., Zhang, L., Guan, Y., et al. (2003) · Science · doi:10.1126/science.1087139 · Cited by 2,404 · see citing works
Virus taxonomy: classification and nomenclature of viruses
King, A. M. Q., Adams, M. J., Carstens, E. B., & Lefkowitz, E. J. (2012) · Cited by 2,088 · see citing works
Structure of SARS Coronavirus Spike Receptor-Binding Domain Complexed with Receptor
Li, F., Li, W., Farzan, M., & Harrison, S. C. (2005) · Science · doi:10.1126/science.1116480 · Cited by 2,031 · see citing works
The Genome Sequence of the SARS-Associated Coronavirus
Marra, M. A., Jones, S. J. M., Astell, C. R., Holt, R. A., Brooks-Wilson, A. R., Butterfield, Y. S. N., Khattra, J. S., Asano, J. K., Barber, S., Chan, S. Y., et al. (2003) · Science · doi:10.1126/science.1085953 · Cited by 2,017 · see citing works
Fruit bats as reservoirs of Ebola virus
Leroy, E. M., Kumulungui, B., Pourrut, X., Rouquet, P., Hassanin, A., Yaba, P., Delicat, A., Paweska, J. T., Gonzalez, J., & Swanepoel, R. (2005) · Nature · doi:10.1038/438575a · Cited by 1,620 · see citing works
Zhong, N., Zheng, B., Li, Y., Poon, L., Xie, Z., Chan, K., Li, P. H., Tan, S., Chang, Q., Xie, J., et al. (2003) · The Lancet · doi:10.1016/s0140-6736(03)14630-2 · Cited by 1,578 · see citing works
Severe acute respiratory syndrome coronavirus-like virus in Chinese horseshoe bats
Lau, S. K. P., Woo, P. C. Y., Li, K. S. M., Huang, Y. P., Tsoi, H., Wong, B. H. L., Wong, S. S. Y., Leung, S.-Y., Chan, K., & Yuen, K. (2005) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0506735102 · Cited by 1,529 · see citing works
Swaminathan, B., Barrett, T. J., Hunter, S. B., Tauxe, R. V., & the CDC PulseNet Task Force (2001) · Emerging infectious diseases · doi:10.3201/eid0703.010303 · Cited by 1,075 · see citing works
Receptor and viral determinants of SARS‐coronavirus adaptation to human ACE2
Li, W., Zhang, C., Sui, J., Kuhn, J. H., Moore, M. J., Luo, S., Wong, S.-K., Huang, I., Xu, K., Vasilieva, N. Y., et al. (2005) · The EMBO Journal · doi:10.1038/sj.emboj.7600640 · Cited by 976 · see citing works
Koch's postulates fulfilled for SARS virus
Fouchier, R. A. M., Kuiken, T., Schutten, M., van Amerongen, G., van Doornum, G. J. J., van den Hoogen, B. G., Peiris, M. J. S., Lim, W. W. L., Stöhr, K., & Osterhaus, A. D. M. E. (2003) · Nature · doi:10.1038/423240a · Cited by 790 · see citing works
Molecular Evolution of the SARS Coronavirus During the Course of the SARS Epidemic in China
The Chinese SARS Molecular Epidemiology Consortium (2004) · Science · doi:10.1126/science.1092002 · Cited by 765 · see citing works
Wong, S. K., Li, W., Moore, M. J., Choe, H., & Farzan, M. (2004) · Journal of Biological Chemistry · doi:10.1074/jbc.c300520200 · Cited by 690 · see citing works
Cross-host evolution of severe acute respiratory syndrome coronavirus in palm civet and human
Song, H., Tu, C., Zhang, G., Wang, S., Zheng, K. C., Lei, L., Chen, Q., Gao, Y., Zhou, H., Xiang, H., et al. (2005) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0409608102 · Cited by 683 · see citing works
Isolation of Hendra virus from pteropid bats: a natural reservoir of Hendra virus
Halpin, K., Young, P. L., Field, H. E., et al. (2000) · Journal of General Virology · doi:10.1099/0022-1317-81-8-1927 · Cited by 681 · see citing works
SARS virus infection of cats and ferrets
Martina, B. E. E., Haagmans, B. L., Kuiken, T., Fouchier, R. A. M., Rimmelzwaan, G. F., van Amerongen, G., Peiris, M. J. S., Lim, W. W. L., & Osterhaus, A. D. M. E. (2003) · Nature · doi:10.1038/425915a · Cited by 571 · see citing works
Subbarao, K., McAuliffe, J. M., Vogel, L., Fahle, G. A., Fischer, S. H., Tatti, K. M., Packard, M. M., Shieh, W., Zaki, S. R., & Murphy, B. R. (2004) · Journal of Virology · doi:10.1128/jvi.78.7.3572-3577.2004 · Cited by 397 · see citing works
Identification of a Novel Coronavirus in Bats
Poon, L., Chu, D., Chan, K., Wong, O., Ellis, T., Leung, Y. C., Lau, S., Woo, P. C. Y., Suen, K.-Y., Yuen, K. Y., et al. (2005) · Journal of Virology · doi:10.1128/jvi.79.4.2001-2009.2005 · Cited by 391 · see citing works
SARS-CoV Infection in a Restaurant from Palm Civet
Wang, M., Yan, M., Xu, H., Liang, W., Kan, B., Zheng, B., Chen, H., Zheng, H., Xu, Y., Zhang, E., et al. (2005) · Emerging infectious diseases · doi:10.3201/eid1112.041293 · Cited by 348 · see citing works
Kan, B., Wang, M., Jing, H., Xu, H., Jiang, X., Yan, M., Liang, W., Zheng, H., Wan, K., Liu, Q., et al. (2005) · Journal of Virology · doi:10.1128/jvi.79.18.11892-11900.2005 · Cited by 346 · see citing works
Glass, W. G., Subbarao, K., Murphy, B. R., & Murphy, P. M. (2004) · The Journal of Immunology · doi:10.4049/jimmunol.173.6.4030 · Cited by 337 · see citing works
Epidemiologic Clues to SARS Origin in China
Xu, R.-H., He, J., Evans, M. R., Peng, G.-W., Field, H. E., Yu, D.-W., Lee, C.-K., Luo, H.-M., Lin, W.-S., Lin, P., et al. (2004) · Emerging infectious diseases · doi:10.3201/eid1006.030852 · Cited by 327 · see citing works
The Biology and Conservation of Wild Canids
(2004) · doi:10.1093/acprof:oso/9780198515562.001.0001 · Cited by 323 · see citing works
Moderate mutation rate in the SARS coronavirus genome and its implications
Zhao, Z., Li, H., Wu, X., Zhong, Y., Zhang, K., Zhang, Y.-P., Boerwinkle, E., & Fu, Y.-X. (2004) · BMC Evolutionary Biology · doi:10.1186/1471-2148-4-21 · Cited by 286 · see citing works
Severe Acute Respiratory Syndrome Coronavirus Infection of Golden Syrian Hamsters
Roberts, A., Vogel, L. N., Guarner, J., Hayes, N., Murphy, B., Zaki, S., & Subbarao, K. (2005) · Journal of Virology · doi:10.1128/jvi.79.1.503-511.2005 · Cited by 273 · see citing works
Li, W., Wong, S.-K., Li, F., Kuhn, J. H., Huang, I., Choe, H., & Farzan, M. (2006) · Journal of Virology · doi:10.1128/jvi.80.9.4211-4219.2006 · Cited by 273 · see citing works
Yount, B. L., Roberts, R., Sims, A. M., Deming, D., Frieman, M. B., Sparks, J. S., Denison, M. R., Davis, N., & Baric, R. S. (2005) · Journal of Virology · doi:10.1128/jvi.79.23.14909-14922.2005 · Cited by 250 · see citing works
Antibodies to SARS Coronavirus in Civets
Tu, C., Crameri, G. S., Kong, X., et al. (2004) · Emerging infectious diseases · doi:10.3201/eid1012.040520 · Cited by 242 · see citing works
McAuliffe, J. M., Vogel, L., Roberts, A., Fahle, G. A., Fischer, S. H., Shieh, W., Butler, E. L., Zaki, S. R., Claire, M. S., Murphy, B. R., et al. (2004) · Virology · doi:10.1016/j.virol.2004.09.030 · Cited by 203 · see citing works
Roberts, A., Paddock, C. D., Vogel, L., Butler, E. L., Zaki, S. R., & Subbarao, K. (2005) · Journal of Virology · doi:10.1128/jvi.79.9.5833-5838.2005 · Cited by 196 · see citing works
Qu, X., Hao, P., Song, X., Jiang, S., Liu, Y., Wang, P., Rao, X., Song, H., Wang, S., Zuo, Y., et al. (2005) · Journal of Biological Chemistry · doi:10.1074/jbc.m500662200 · Cited by 159 · see citing works
Liang, G., Chen, Q., Xu, J., Liu, Y., Lim, W. W. L., Peiris, M. J. S., Anderson, L. J., Ruan, L., Li, H., Kan, B., et al. (2004) · Emerging infectious diseases · doi:10.3201/eid1010.040445 · Cited by 136 · see citing works
Wu, D., Tu, C., Xin, C., Hua, X., Meng, Q., Liu, Y., Yu, Y., Guan, Y., Jiang, Y. Y., Yin, X., et al. (2005) · Journal of Virology · doi:10.1128/jvi.79.4.2620-2625.2005 · Cited by 135 · see citing works
Yeh, S., Wang, H., Tsai, C., Kao, C., Yang, J.-Y., Liu, H.-W., Su, I., Tsai, S., Chen, D., & Chen, P. (2004) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0307904100 · Cited by 125 · see citing works
Macaque Model for Severe Acute Respiratory Syndrome
Rowe, T., Gao, G., Hogan, R. J., Crystal, R. G., Voss, T. G., Grant, R. L., Bell, P. L., Kobinger, G., Wivel, N. A., & Wilson, J. M. (2004) · Journal of Virology · doi:10.1128/jvi.78.20.11401-11404.2004 · Cited by 122 · see citing works
Ren, W., Li, W., Yu, M., Hao, P., Zhang, Y., Zhou, P., Zhang, S. Y., Zhao, G., Zhong, Y., Wang, S., et al. (2006) · Journal of General Virology · doi:10.1099/vir.0.82220-0 · Cited by 118 · see citing works
Self-citationSARS-associatedCoronavirus Transmitted from Human to Pig
Chen, W., Yan, M., Yang, L., Ding, B., He, B., Wang, Y., Liu, X., Liu, C., Zhu, H., You, B., et al. (2005) · Emerging infectious diseases · doi:10.3201/eid1103.040824 · Cited by 107 · see citing works
(2003) · PubMed · Cited by 97 · see citing works
An animal model of SARS produced by infection of Macaca mulatta with SARS coronavirus
Qin, C., Wang, J., Wei, Q., She, M., Marasco, W. A., Jiang, H., Tu, X., Zhu, H., Ren, L., Gao, H., et al. (2005) · The Journal of Pathology · doi:10.1002/path.1769 · Cited by 96 · see citing works
Susceptibility of Pigs and Chickens to SARS Coronavirus
Weingartl, H. M., Copps, J. S., DREBOT, M. A., Marszal, P., Smith, G. A., Gren, J., Andonova, M., Pasick, J. M. M., Kitching, P., & Czub, M. (2004) · Emerging infectious diseases · doi:10.3201/eid1002.030677 · Cited by 85 · see citing works
Mice Susceptible to SARS Coronavirus
Wentworth, D. E., Gillim-Ross, L., Espina, N. G., et al. (2004) · Emerging infectious diseases · doi:10.3201/eid1007.031119 · Cited by 69 · see citing works
Mutational dynamics of the SARS coronavirus in cell culture and human populations isolated in 2003
Vega, V. B., Ruan, Y., Liu, J., Lee, W. H., Wei, C. L., Se-Thoe, S. Y., Tang, K. F., Zhang, T., Kolatkar, P. R., Ooi, E. E., et al. (2004) · BMC Infectious Diseases · doi:10.1186/1471-2334-4-32 · Cited by 65 · see citing works
Emerging encephalitogenic viruses: lyssaviruses and henipaviruses transmitted by frugivorous bats
Mackenzie, J. S., & Field, H. E. (2004) · Springer eBooks · doi:10.1007/978-3-7091-0572-6_8 · Cited by 48 · see citing works
Serosurvey for Selected Virus Infections of Wild Carnivores in Taiwan and Vietnam
Ikeda, Y., Miyazawa, T., Nakamura, K., et al. (1999) · Journal of Wildlife Diseases · doi:10.7589/0090-3558-35.3.578 · Cited by 48 · see citing works
Liang, L., He, C., Lei, M., et al. (2005) · DNA and Cell Biology · doi:10.1089/dna.2005.24.485 · Cited by 45 · see citing works
Does IBV Change Slowly Despite the Capacity of the Spike Protein to Vary Greatly?
Cavanagh, D. R., Mawditt, K. L., Adzhar, A., Gough, R. E., Picault, J. P., Naylor, C. J., Haydon, D. T., Shaw, K., & Britton, P. (1998) · Advances in experimental medicine and biology · doi:10.1007/978-1-4615-5331-1_94 · Cited by 44 · see citing works
Tracing SARS-Coronavirus Variant with Large Genomic Deletion
Chiu, R. W. K., Chim, S. S. C., Tong, Y., Fung, K. S. C., Chan, P. K. S., Zhao, G., & Lo, Y. M. D. (2005) · Emerging infectious diseases · doi:10.3201/eid1101.040544 · Cited by 40 · see citing works
Domestic Poultry and SARS Coronavirus, Southern China
Swayne, D. E., Suarez, D. L., Spackman, E., et al. (2004) · Emerging infectious diseases · doi:10.3201/eid1005.030827 · Cited by 34 · see citing works
Chen, W., & Baric, R. S. (1995) · Journal of Virology · doi:10.1128/jvi.69.12.7529-7540.1995 · Cited by 34 · see citing works
Wang, M., Jing, H. Q., Xu, H., et al. (2005) · PubMed · Cited by 31 · see citing works
Antigen selection and presentation to protect against transmissible gastroenteritis coronavirus
Enjuanes, L., Suñé, C., Gebauer, F., Smerdou, C., Camacho, A., Anton, I. M., González, S., Talamillo, A., Méndez, A., Ballesteros, M. L., et al. (1992) · Veterinary Microbiology · doi:10.1016/0378-1135(92)90053-v · Cited by 28 · see citing works
Xu, H. F., Wang, M., Zhang, Z. B., et al. (2004) · PubMed · Cited by 26 · see citing works
Hu, L., Zheng, G., Jiang, H.-S., et al. (2003) · PubMed · Cited by 12 · see citing works
Emerging Viral Diseases of Southeast Asia and the Western Pacific
Mackenzie, J. S., Chua, K. B., Daniels, P. W., Eaton, B. T., Field, H. E., Hall, R. A., Halpin, K., Johansen, C. A., Kirkland, P. D., Lam, S. K., et al. (2001) · Emerging infectious diseases · doi:10.3201/eid0707.017703 · Cited by 12 · see citing works
Hu, W., Bai, B., Hú, Z., Chen, Z., An, X., Tang, L., Yang, J., Wáng, H., & Wang, H. (2005) · Journal of Clinical Microbiology · doi:10.1128/jcm.43.5.2041-2046.2005 · Cited by 8 · see citing works
Status of the Research on Masked Palm Civets
Zhi, J. (2003) · Cited by 6 · see citing works
The First Incident of Virus Enteritis in Masked Civet: Its Diagnosis and Prevention
Wen, D. (2001) · Jingji dongwu xuebao · Cited by 1 · see citing works
Flagged first, then by citations
Research works printed but not linked: 6
- Gao Y. Fauna Sinica Mammalia Carnivora 1987 Science Press Beijing p. 8
- Holmes, K.V., 2001. Coronaviridae and their replication. In: Knipe, D.M., Roizman, B., Howley, P.M., Straus, S.E., Fields, B.N., Griffin, D.E., Martin, M.A., L.R.A. (Eds.), Fields Virology. Lippincott Williams & Wilkins, Philadelphia, Pennsylvania, USA, pp. 1187–1203.
- Kunz T.H. Fenton M.B. Bat Ecology 2003 University of Chicago Press Chicago
- Shao, M., Li, J., 1997. Raising and management of masked palm civet (P. larvata). J. Shaanxi Normal Univ. (Nat. Sci. ed.) 25 (Suppl.), 157–161.
- Tong Y.R. The resources of the precious fur animals in China Tong Y.R. Qian G.C. A Comprehensive Breeding Technique of Chinese Fur Animals 1990 Chinese Agricultural Science and Technology Press Beijing, China 15 24 (chapter 1)
- Zhang R. Zoogeography of China vol. 238 1999 Academy Press p. 477
Cited by
Sorted by citations
Muñoz-Fontela, C., Dowling, W. E., Funnell, S. G. P., Gsell, P.-S., Riveros-Balta, A. X., Albrecht, R. A., Andersen, H., Baric, R. S., Carroll, M. W., Cavaleri, M., et al. (2020) · Nature · doi:10.1038/s41586-020-2787-6 · Cited by 798 · see citing works
The Lancet Commission on lessons for the future from the COVID-19 pandemic
Sachs, J. D., Karim, S. S. A., Aknin, L., Allen, J., Brosbøl, K., Colombo, F., Barron, G. C., Espinosa, M. F., Gaspar, V., Gaviria, A., et al. (2022) · The Lancet · doi:10.1016/s0140-6736(22)01585-9 · Cited by 842 · see citing works
- Authors
- Shi, Z., & Hu, Z.
- Affiliations
- Chinese Academy of Sciences (CN)
- Venue
- Virus Research
- Publisher
- Elsevier BV
- Published
- 2008-04
- Volume
- 133
- Issue
- 1
- Pages
- 74-87
- ISSN
- 0168-1702 (ISSN-L)
- PMC
- PMC7114516
- OpenAlex
- W2044343035
- Cited by
- 400
- References
- 62
- Citations by year
- 2026: 5 · 2025: 19 · 2024: 22 · 2023: 20 · 2022: 33 · 2021: 79 · 2020: 106 · 2019: 6 · 2018: 1 · 2017: 3 · 2016: 11 · 2015: 7 · 2014: 19 · 2013: 13 · 2012: 12
- FWCI
- 7.34
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Virus Research (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Zenodo (CERN European Organization for Nuclear Research) (submittedVersion, cc-by)
- Funders
- European Commission
- Topics
- Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Virus Infections Studies
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Zoonotic diseases and public health
- Keywords
- SARS coronavirus, reservoir hosts, masked palm civet, horseshoe bats, 2003 SARS outbreak, single nucleotide variants, zoonotic transmission
- MeSH terms
- Animals, Antibodies, Viral, Base Sequence, Chiroptera, Disease Reservoirs, Humans, Molecular Sequence Data, Viral Proteins, Sequence Alignment, Genome, Viral, Coronavirus, Feline, Severe Acute Respiratory Syndrome, Severe acute respiratory syndrome-related coronavirus, Viverridae
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