RT Journal Article SR Electronic T1 The placebo effect: powerful, powerless or redundant? JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 6 OP 9 DO 10.1136/bjsports-2012-091472 VO 47 IS 1 A1 Steven J Kamper A1 Christopher Michael Williams YR 2013 UL http://bjsm.bmj.com/content/47/1/6.abstract AB