TY - JOUR T1 - Fundamental problem with opioid trials for chronic pain JF - Canadian Medical Association Journal JO - CMAJ SP - 1308 LP - 1308 DO - 10.1503/cmaj.1070003 VL - 176 IS - 9 AU - Andrea D. Furlan AU - Angela Mailis-Gagnon AU - Eldon Tunks Y1 - 2007/04/24 UR - http://www.cmaj.ca/content/176/9/1308.1.abstract ER -