About the Authors
- Deborah A. Zarin
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* E-mail: dzarin@mail.nih.gov (DAZ); atse@mail.nih.gov (TT)
Affiliation National Library of Medicine, National Institutes of Health, Bethesda, Maryland, United States of America
- Tony Tse
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* E-mail: dzarin@mail.nih.gov (DAZ); atse@mail.nih.gov (TT)
Affiliation National Library of Medicine, National Institutes of Health, Bethesda, Maryland, United States of America
Competing Interests
We have read the journal's policy and have the following conflicts: DAZ is Director and TT is an Analyst for ClinicalTrials.gov.
Author Contributions
Wrote the first draft of the manuscript: DAZ TT. Contributed to the writing of the manuscript: DAZ TT. Agree with the manuscript’s results and conclusions: DAZ TT. All authors have read, and confirm that they meet, ICMJE criteria for authorship.