RT Journal Article SR Electronic T1 Response to “Selection bias” JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E674 OP E674 DO 10.1503/cmaj.732964 VO 189 IS 18 A1 Andrea K. Boggild A1 Michael Libman A1 Cedric P. Yansouni A1 David O. Freedman A1 Susan Kuhn A1 Pierre Plourde A1 Yazdan Mirzanejad A1 Jan Hajek A1 Sumontra Chakrabarti A1 Jennifer Geduld A1 Anne E. McCarthy A1 Jean Vincelette A1 Wayne Ghesquiere A1 Kevin C. Kain YR 2017 UL http://www.cmaj.ca/content/189/18/E674.abstract AB