Natarajan, Karthik

The National COVID Cohort Collaborative (N3C): Rationale, design, infrastructure, and deployment

Haendel, M. A., Chute, C. G., Bennett, T. D., Eichmann, D. A., Guinney, J., Kibbe, W. A., Payne, P. R. O., Pfaff, E. R., Robinson, P. N., Saltz, J. H., et al. (2021) · Journal of the American Medical Informatics Association

Research Data Management PracticesElectronic Health Records Systems

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Waning 2-Dose and 3-Dose Effectiveness of mRNA Vaccines Against COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance — VISION Network, 10 States, August 2021–January 2022

Ferdinands, J. M., Rao, S., Dixon, B. E., Mitchell, P. K., DeSilva, M. B., Irving, S. A., Lewis, N., Natarajan, K., Stenehjem, E., Grannis, S. J., et al. (2022) · MMWR. Morbidity and Mortality Weekly Report

SARS-CoV-2 and COVID-19 ResearchVaccine Coverage and Hesitancy

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Effectiveness of a Third Dose of mRNA Vaccines Against COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance — VISION Network, 10 States, August 2021–January 2022

Thompson, M. G., Natarajan, K., Irving, S. A., Rowley, E. A., Griggs, E. P., Gaglani, M., Klein, N. P., Grannis, S. J., DeSilva, M. B., Stenehjem, E., et al. (2022) · MMWR. Morbidity and Mortality Weekly Report

SARS-CoV-2 and COVID-19 ResearchVaccine Coverage and Hesitancy

Cited by 398

The All of Us Research Program: Data quality, utility, and diversity

Ramirez, A. H., Sulieman, L., Schlueter, D. J., Halvorson, A., Qian, J., Ratsimbazafy, F., Loperena, R., Mayo, K., Basford, M., Deflaux, N., et al. (2022) · Patterns

Electronic Health Records SystemsEthics in Clinical Research

Cited by 352

Diagnosis code assignment: models and evaluation metrics

Perotte, A., Pivovarov, R., Natarajan, K., Weiskopf, N., Wood, F., & Elhadad, N. (2014) · Journal of the American Medical Informatics Association

Machine Learning in HealthcareMedical Coding and Health Information

Cited by 244

Association of step counts over time with the risk of chronic disease in the All of Us Research Program

Master, H., Annis, J., Huang, S., Beckman, J. A., Ratsimbazafy, F., Marginean, K., Carroll, R., Natarajan, K., Harrell, F. E., Roden, D. M., et al. (2022) · Nature Medicine

Physical Activity and HealthMobile Health and mHealth Applications

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Waning of vaccine effectiveness against moderate and severe covid-19 among adults in the US from the VISION network: test negative, case-control study

Ferdinands, J. M., Rao, S., Dixon, B. E., Mitchell, P. K., DeSilva, M. B., Irving, S. A., Lewis, N., Natarajan, K., Stenehjem, E., Grannis, S. J., et al. (2022) · BMJ

SARS-CoV-2 and COVID-19 ResearchVaccine Coverage and Hesitancy

Cited by 185

Effectiveness of 2, 3, and 4 COVID-19 mRNA Vaccine Doses Among Immunocompetent Adults During Periods when SARS-CoV-2 Omicron BA.1 and BA.2/BA.2.12.1 Sublineages Predominated — VISION Network, 10 States, December 2021–June 2022

Link-Gelles, R., Levy, M. E., Gaglani, M., Irving, S. A., Stockwell, M., Dascomb, K., DeSilva, M. B., Reese, S. E., Liao, I.-C., Ong, T. C., et al. (2022) · MMWR. Morbidity and Mortality Weekly Report

SARS-CoV-2 and COVID-19 ResearchCOVID-19 epidemiological studies

Cited by 126

Are synthetic clinical notes useful for real natural language processing tasks: A case study on clinical entity recognition

Li, J., Zhou, Y., Jiang, X., Natarajan, K., Pakhomov, S. V., Liu, H., & Xu, H. (2021) · Journal of the American Medical Informatics Association

Biomedical Text Mining and OntologiesTopic Modeling

Cited by 53

Association of Longitudinal Activity Measures and Diabetes Risk: An Analysis From the National Institutes of Health All of Us Research Program

Perry, A. S., Annis, J. S., Master, H., Nayor, M., Hughes, A., Kouame, A., Natarajan, K., Marginean, K., Murthy, V., Roden, D. M., et al. (2023) · The Journal of Clinical Endocrinology & Metabolism

Physical Activity and HealthDiabetes Management and Research

Cited by 29

Identifying Data Quality Dimensions for Person-Generated Wearable Device Data: Multi-Method Study

Cho, S., Weng, C., Kahn, M. G., & Natarajan, K. (2021) · JMIR mHealth and uHealth

Data Quality and ManagementResearch Data Management Practices

Cited by 28

Representing and utilizing clinical textual data for real world studies: An OHDSI approach

Keloth, V. K., Banda, J. M., Gurley, M., Heider, P. M., Kennedy, G., Liu, H., Liu, F., Miller, T., Natarajan, K., V Patterson, O., et al. (2023) · Journal of Biomedical Informatics

Biomedical Text Mining and OntologiesMachine Learning in Healthcare

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Association between COVID-19 mRNA vaccination and COVID-19 illness and severity during Omicron BA.4 and BA.5 sublineage periods

Link-Gelles, R., Levy, M. E., Natarajan, K., Reese, S. E., Naleway, A. L., Grannis, S. J., Klein, N. P., DeSilva, M. B., Ong, T. C., Gaglani, M., et al. (2022) · medRxiv

SARS-CoV-2 and COVID-19 ResearchCOVID-19 Clinical Research Studies

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