1. The status of trial registration eleven years after the ICMJE policy;Zarin;N Engl J Med,2017
2. https://www.govinfo.gov/content/pkg/PLAW-105publ115/html/PLAW-105publ 115.htm
3. https://www.govinfo.gov/content/pkg/PLAW-110publ85/pdf/PLAW-110publ85.pdf
4. http://www.icmje.org/recommendations/browse/publishing-and-editorial-issues/clinical-trial-registration.html
5. https://grants.nih.gov/grants/guide/notice-files/NOT-OD-16-149.html