TY - CPAPER AU - Kamper S. BT - IASP Placebo Special Interest Group, Symposium on the Placebo Effect CY - Copenhagen, Denmark DA - -34369393620 LA - eng LB - MSconference presentation PP - Copenhagen, Denmark PY - 2008 T2 - IASP Placebo Special Interest Group, Symposium on the Placebo Effect TI - Trial methodology and patient characteristics did not influence the size of placebo effects on pain in randomized controlled trials ER -