RT Journal Article SR Electronic T1 Clarifying a misunderstanding on clinical trial registry JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 203 OP 206 DO 10.1503/cmaj.1050201 VO 174 IS 2 A1 Deborah A. Zarin YR 2006 UL http://www.cmaj.ca/content/174/2/203.3.abstract