1. Previously unidentified duplicate registrations of clinical trials: an exploratory analysis of registry data worldwide. Issue 1 (December 2016) Authors: van Valkenhoef, Gert; Loane, Russell; Zarin, Deborah Journal: Systematic reviews Issue: Volume 5:Issue 1(2016) Page Start: 1 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗