RT Journal Article SR Electronic T1 Registering systematic reviews JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 13 OP 14 DO 10.1503/cmaj.081849 VO 182 IS 1 A1 Sharon Straus A1 David Moher YR 2010 UL http://www.cmaj.ca/content/182/1/13.abstract