What should clinicians tell patients about placebo and nocebo effects? Practical considerations based on expert consensus by Evers, AWM, Colloca, L, Blease, C, Gaab, J, Jensen, KB, Atlas, LY, Beedie, CJ, Benedetti, F, Bingel, U, Büchel, C, Bussemaker, J, Colagiuri, B, Crum, AJ, Finniss, DG, Geers, AL, Howick, J, Klinger, R, Meeuwis, SH, Meissner, K, Napadow, V, Petrie, KJ, Rief, W, Smeets, I, Wager, TD, Wanigasekera, V, Vase, L, Kelley, JM, Kirsch, I, Consortium of Placebo Experts