RT Journal Article SR Electronic T1 The authors respond JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1604 OP 1604 DO 10.1503/cmaj.112-2053 VO 184 IS 14 A1 Walter, Simon J. A1 Studdert, David M. YR 2012 UL http://www.cmaj.ca/content/184/14/1604.2.abstract