TY - JOUR T1 - Friend or foe JF - Canadian Family Physician JO - Can Fam Physician SP - 1631 LP - 1631 VL - 53 IS - 10 AU - Diane Kelsall Y1 - 2007/10/01 UR - http://www.cfp.ca/content/53/10/1631.abstract N2 - ER -