TY - JOUR AN - 13 AU - Labus,J.S. AU - Keefe,F.J. AU - Jensen,M.P. TI - Self-reports of pain intensity and direct observations of pain behavior: When are they correlated? JO - Pain PY - 2003 VL - 102 SP - 109-124 M2 - 109 DO - 10.1016/s0304-3959(02)00354-8 ER -