TY - JOUR T1 - Multiple opioids in pain management JF - Canadian Family Physician JO - Can Fam Physician SP - 2119 LP - 2120 VL - 53 IS - 12 AU - Romayne Gallagher Y1 - 2007/12/01 UR - http://www.cfp.ca/content/53/12/2119.abstract N2 - ER -