PT - JOURNAL ARTICLE AU - Mercer, Jay G. TI - Powerful tool with manageable risks DP - 2014 Jun 01 TA - Canadian Family Physician PG - 522--522 VI - 60 IP - 6 4099 - http://www.cfp.ca/content/60/6/522.2.short 4100 - http://www.cfp.ca/content/60/6/522.2.full SO - Can Fam Physician2014 Jun 01; 60