Tse T, Zarin D, Williams R, Ide N.The role and importance of clinical trial registries and results databases In: Gallin JI, Ognibene FP, eds, Principles and Practice of Clinical Research. 3rd ed. Amsterdam: Academic Press; 2012: 171-81.
Williams R, Tse T, Zarin D.Characterizing sponsor-imposed restrictions on disclosing results of clinical trials. Presented at: Sixth International Congress on Peer Review and Biomedical Publication; September 2009; Vancouver, BC, Canada.