The employment information for Dr. Michel Joffres and Dr. Gabriela Lewin was incorrect in the guidelines1 that appeared in the Nov. 22, 2011, issue of CMAJ. Dr. Joffres is affiliated with the Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia. Dr. Lewin is an associate physician with the Kemptville District Hospital in Kemptville, Ontario. Dr. Lewin is not an employee of the hospital. We apologize for any inconvenience these errors have caused.