The placebo response and effect of time in a trial of acupuncture to treat nausea and vomiting in early pregnancy

Smith, 2002, Acupuncture to treat nausea and vomiting in early pregnancy: randomised controlled trial, Birth, 29, 1, 10.1046/j.1523-536X.2002.00149.x Vincent, 1990, Credibility assessment in trials of acupuncture, Comp. Med. Res., 4, 8 Zaslawski, 1997, Strategies to maintain the credibility of sham acupuncture used as a control treatment, J. Altern. Complement. Med., 3, 257, 10.1089/acm.1997.3.257 Borkovec, 1972, Credibility of analogue therapy rationales, J. Behav. Ther. Exp. Psychiatry, 3, 257, 10.1016/0005-7916(72)90045-6 Beecher, 1955, The powerful placebo, JAMA, 159, 160 Archer, 1992, Placebo treatment in congestive heart failure, Cardiology J., 81, 125, 10.1159/000175787 Rosenberg, 1991, Characteristics of panic disorder patients responding to placebo, Acta Psychiatr. Scand. Suppl., 365, 33, 10.1111/j.1600-0447.1991.tb03099.x Rhodes, 1984, Development of a reliable and valid measure for nausea and vomiting, Cancer Nurs., 7, 33, 10.1097/00002820-198402000-00003 Streitberger, 1998, Introducing a placebo needle into acupuncture research, Lancet, 352, 364, 10.1016/S0140-6736(97)10471-8