PT - JOURNAL ARTICLE AU - Andrea D. Furlan AU - Angela Mailis-Gagnon AU - Eldon Tunks TI - Fundamental problem with opioid trials for chronic pain AID - 10.1503/cmaj.1070003 DP - 2007 Apr 24 TA - Canadian Medical Association Journal PG - 1308--1308 VI - 176 IP - 9 4099 - http://www.cmaj.ca/content/176/9/1308.1.short 4100 - http://www.cmaj.ca/content/176/9/1308.1.full SO - CMAJ2007 Apr 24; 176