TY - JOUR T1 - A brief review of the literature JF - Canadian Family Physician JO - Can Fam Physician SP - 1515 LP - 1515 VL - 53 IS - 9 A2 - , Y1 - 2007/09/01 UR - http://www.cfp.ca/content/53/9/1515.abstract N2 - ER -