TY - JOUR AU - Hrobjartsson, A.; Gotzsche, P.C TI - Is the placebo powerless? Update of a systematic review with 52 new randomized trials comparing placebo with no treatment JO - J Intern Med IS - 02 VL - 256 PY - 2004 DO - 10.1111/j.1365-2796.2004.01355.x L3 - PubMed-ID: 15257721 SP - 91 EP - 100. ER -