PT - JOURNAL ARTICLE AU - Allan Grill TI - Response DP - 2009 May 01 TA - Canadian Family Physician PG - 470--470 VI - 55 IP - 5 4099 - http://www.cfp.ca/content/55/5/470.4.short 4100 - http://www.cfp.ca/content/55/5/470.4.full SO - Can Fam Physician2009 May 01; 55