User profiles for "author:Karthik Natarajan"

Karthik Natarajan

- Verified email at cumc.columbia.edu - Cited by 7186

Karthik Natarajan

- Verified email at sutd.edu.sg - Cited by 2186

Karthik Natarajan

- Verified email at Intel.com - Cited by 370

[HTML][HTML] The use of social media in recruitment for medical research studies: a scoping review

J Topolovec-Vranic, K Natarajan - Journal of medical Internet research, 2016 - jmir.org
Background Recruiting an adequate number of participants into medical research studies is
challenging for many researchers. Over the past 10 years, the use of social media websites …

[HTML][HTML] Redesigning electronic health record systems to support public health

R Kukafka, JS Ancker, C Chan, J Chelico… - Journal of biomedical …, 2007 - Elsevier
Current electronic health record systems are primarily clinical in focus, designed to provide
patient-level data and provider-level decision support. Adapting EHR systems to serve …

[HTML][HTML] Effectiveness of Covid-19 vaccines in ambulatory and inpatient care settings

MG Thompson, E Stenehjem, S Grannis… - … England Journal of …, 2021 - Mass Medical Soc
Background There are limited data on the effectiveness of the vaccines against symptomatic
coronavirus disease 2019 (Covid-19) currently authorized in the United States with respect …

Characterization and clinical course of 1000 patients with coronavirus disease 2019 in New York: retrospective case series

MG Argenziano, SL Bruce, CL Slater, JR Tiao… - bmj, 2020 - bmj.com
Objective To characterize patients with coronavirus disease 2019 (covid-19) in a large New
York City medical center and describe their clinical course across the emergency …

[HTML][HTML] Factors affecting the quality of person-generated wearable device data and associated challenges: Rapid systematic review

S Cho, I Ensari, C Weng, MG Kahn… - JMIR mHealth and …, 2021 - mhealth.jmir.org
Background There is increasing interest in reusing person-generated wearable device data
for research purposes, which raises concerns about data quality. However, the amount of …

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

MA Haendel, CG Chute, TD Bennett… - Journal of the …, 2021 - academic.oup.com
Abstract Objective Coronavirus disease 2019 (COVID-19) poses societal challenges that
require expeditious data and knowledge sharing. Though organizational clinical data are …

Body mass index and risk for intubation or death in SARS-CoV-2 infection: a retrospective cohort study

MR Anderson, J Geleris, DR Anderson… - Annals of internal …, 2020 - acpjournals.org
Background: Obesity is a risk factor for pneumonia and acute respiratory distress syndrome.
Objective: To determine whether obesity is associated with intubation or death …

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

JM Ferdinands, S Rao, BE Dixon, PK Mitchell… - bmj, 2022 - bmj.com
Objective To estimate the effectiveness of mRNA vaccines against moderate and severe
covid-19 in adults by time since second, third, or fourth doses, and by age and …

Models for minimax stochastic linear optimization problems with risk aversion

D Bertsimas, XV Doan, K Natarajan… - Mathematics of …, 2010 - pubsonline.informs.org
We propose a semidefinite optimization (SDP) model for the class of minimax two-stage
stochastic linear optimization problems with risk aversion. The distribution of second-stage …

Diagnosis code assignment: models and evaluation metrics

A Perotte, R Pivovarov, K Natarajan… - Journal of the …, 2014 - academic.oup.com
Background and objective The volume of healthcare data is growing rapidly with the
adoption of health information technology. We focus on automated ICD9 code assignment …