When are clinical trials registered? An analysis of prospective versus retrospective registration

The Quality of Registration of Clinical Trials: Still a Problem

(2014) Roderik F. Viergever et al.   PLoS One

Registration Rates, Adequacy of Registration, and a Comparison of Registered and Published Primary Outcomes in Randomized Controlled Trials Published in Surgery Journals

(2013) Shane Killeen et al.   ANNALS OF SURGERY

Evaluating adherence to the International Committee of Medical Journal Editors' policy of mandatory, timely clinical trial registration

(2013) Vojtech Huser et al.   JOURNAL OF THE AMERICAN MEDICAL INFORMATICS ASSOCIATION

Surgical trials and trial registers: a cross-sectional study of randomized controlled trials published in journals requiring trial registration in the author instructions

(2013) Julia LS Hardt et al.   Trials

Trial Registration Numbers Are Underreported in Biomedical Publications

(2012) Fleur T. van de Wetering et al.   PLoS One

The Quality of Registration of Clinical Trials

(2011) Roderik F. Viergever et al.   PLoS One

Update on Registration of Clinical Trials in ClinicalTrials.gov

(2009) Tony Tse et al.   CHEST

Selective Publication of Antidepressant Trials and Its Influence on Apparent Efficacy

(2008) Erick H. Turner et al.   NEW ENGLAND JOURNAL OF MEDICINE

Systematic Review of the Empirical Evidence of Study Publication Bias and Outcome Reporting Bias

(2008) Kerry Dwan et al.   PLoS One