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Methods to Adjust for Confounding in Test-Negative Design COVID-19 Effectiveness Studies: Simulation Study

Elizabeth AK Rowley, Patrick K Mitchell, Duck-Hye Yang, Ned Lewis, Brian E Dixon, Gabriela Vazquez-Benitez, William F Fadel, Inih J Essien, Allison L Naleway, Edward Stenehjem, Toan C Ong, Manjusha Gaglani, Karthik Natarajan, Peter Embi, Ryan E Wiegand, Ruth Link-Gelles, Mark W Tenforde, Bruce Fireman

JMIR Form Res 2025;9:e58981

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A Case Demonstration of the Open Health Natural Language Processing Toolkit From the National COVID-19 Cohort Collaborative and the Researching COVID to Enhance Recovery Programs for a Natural Language Processing System for COVID-19 or Postacute Sequelae of SARS CoV-2 Infection: Algorithm Development and Validation

Andrew Wen, Liwei Wang, Huan He, Sunyang Fu, Sijia Liu, David A Hanauer, Daniel R Harris, Ramakanth Kavuluru, Rui Zhang, Karthik Natarajan, Nishanth P Pavinkurve, Janos Hajagos, Sritha Rajupet, Veena Lingam, Mary Saltz, Corey Elowsky, Richard A Moffitt, Farrukh M Koraishy, Matvey B Palchuk, Jordan Donovan, Lora Lingrey, Garo Stone-DerHagopian, Robert T Miller, Andrew E Williams, Peter J Leese, Paul I Kovach, Emily R Pfaff, Mikhail Zemmel, Robert D Pates, Nick Guthe, Melissa A Haendel, Christopher G Chute, Hongfang Liu, National COVID Cohort Collaborative, The RECOVER Initiative

JMIR Med Inform 2024;12:e49997

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Leveraging Social Media to Predict COVID-19–Induced Disruptions to Mental Well-Being Among University Students: Modeling Study

Vedant Das Swain, Jingjing Ye, Siva Karthik Ramesh, Abhirup Mondal, Gregory D Abowd, Munmun De Choudhury

JMIR Form Res 2024;8:e52316

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A Novel Theory-Based Virtual Reality Training to Improve Patient Safety Culture in the Department of Surgery of a Large Academic Medical Center: Protocol for a Mixed Methods Study

Lukasz M Mazur, Amro Khasawneh, Christi Fenison, Shawna Buchanan, Ian M Kratzke, Karthik Adapa, Selena J An, Logan Butler, Ashlyn Zebrowski, Praneeth Chakravarthula, Jin H Ra

JMIR Res Protoc 2022;11(8):e40445

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Development of a Patient-Centered Preference Tool for Patients With Hematologic Malignancies: Protocol for a Mixed Methods Study

Amy Cole, Daniel R Richardson, Karthik Adapa, Amro Khasawneh, Norah Crossnohere, John F P Bridges, Lukasz Mazur

JMIR Res Protoc 2022;11(6):e39586

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Risk Factors Associated With SARS-CoV-2 Breakthrough Infections in Fully mRNA-Vaccinated Individuals: Retrospective Analysis

Cong Liu, Junghwan Lee, Casey Ta, Ali Soroush, James R Rogers, Jae Hyun Kim, Karthik Natarajan, Jason Zucker, Yehoshua Perl, Chunhua Weng

JMIR Public Health Surveill 2022;8(5):e35311

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Improving Outcomes Through Personalized Recommendations in a Remote Diabetes Monitoring Program: Observational Study

Sowmya Kamath, Karthik Kappaganthu, Stefanie Painter, Anmol Madan

JMIR Form Res 2022;6(3):e33329

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

Sylvia Cho, Chunhua Weng, Michael G Kahn, Karthik Natarajan

JMIR Mhealth Uhealth 2021;9(12):e31618

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Columbia Open Health Data for COVID-19 Research: Database Analysis

Junghwan Lee, Jae Hyun Kim, Cong Liu, George Hripcsak, Karthik Natarajan, Casey Ta, Chunhua Weng

J Med Internet Res 2021;23(9):e31122

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Predicting Kidney Graft Survival Using Machine Learning Methods: Prediction Model Development and Feature Significance Analysis Study

Syed Asil Ali Naqvi, Karthik Tennankore, Amanda Vinson, Patrice C Roy, Syed Sibte Raza Abidi

J Med Internet Res 2021;23(8):e26843

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