About the Authors

Tianjing Li

Contributed equally to this work with: Tianjing Li, Tsung Yu

tli19@jhu.edu

Affiliation Center for Clinical Trials and Evidence Synthesis, Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Tsung Yu

Contributed equally to this work with: Tianjing Li, Tsung Yu

Affiliation Center for Clinical Trials and Evidence Synthesis, Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Barbara S. Hawkins

Affiliation Center for Clinical Trials and Evidence Synthesis, Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Kay Dickersin

Affiliation Center for Clinical Trials and Evidence Synthesis, Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TL TY BH KD. Analyzed the data: TY. Contributed reagents/materials/analysis tools: TL. Wrote the paper: TL TY BH KD. Data collection: TY BH TL.