TY - JOUR T1 - Testing for blinding in sham-controlled studies for procedural interventions: the third-party video method JF - Canadian Medical Association Journal JO - CMAJ SP - E272 LP - E273 DO - 10.1503/cmaj.181590 VL - 191 IS - 10 AU - Jennifer Gill AU - Vinay Prasad Y1 - 2019/03/11 UR - http://www.cmaj.ca/content/191/10/E272.abstract N2 - ER -