Trends in global clinical trial registration: an analysis of numbers of registered clinical trials in different parts of the world from 2004 to 2013.

Viergever, Roderik F; Li, Keyang; (2015) Trends in global clinical trial registration: an analysis of numbers of registered clinical trials in different parts of the world from 2004 to 2013. BMJ open, 5 (9). e008932-. ISSN 2044-6055 DOI: https://doi.org/10.1136/bmjopen-2015-008932

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