TY - JOUR T1 - Thumbs up and down JF - Canadian Medical Association Journal JO - CMAJ SP - E711 LP - E712 DO - 10.1503/cmaj.109-3911 VL - 183 IS - 11 AU - Erin Walkinshaw Y1 - 2011/08/09 UR - http://www.cmaj.ca/content/183/11/E711.abstract ER -