TY - CPAPER AU - Smeets R. BT - 12th World Congress on Pain, International Association for the Study of Pain (IASP) CY - Glasgow, Scotland DA - -34874315220 LA - eng LB - MSconference presentation PP - Glasgow, Scotland PY - 2008 T2 - 12th World Congress on Pain, International Association for the Study of Pain (IASP) TI - Exposure in vivo versus operant graded activity in chronic low back pain patients: results of a randomized controlled trial ER -