A multicentre evaluation of an opioid patient–provider agreement
Joseph V Pergolizzi, Frederick A Curro, Nanada Col, Mary Papa Ghods, Don Vena, Robert Taylor, Frederick Naftolin, Jo Ann LeQuang
Postgraduate Medical Journal Oct 2017, 93 (1104) 613-617; DOI: 10.1136/postgradmedj-2016-134607