RT Journal Article SR Electronic T1 Fundamental problem with opioid trials for chronic pain JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1308 OP 1308 DO 10.1503/cmaj.1070003 VO 176 IS 9 A1 Andrea D. Furlan A1 Angela Mailis-Gagnon A1 Eldon Tunks YR 2007 UL http://www.cmaj.ca/content/176/9/1308.1.abstract