3Asbjom Hrobjartsson, and Peter C. Gotzsche. Is the Placebo Powerless - An Analysis of Clinical Trials Comparing Placebo with No Treatment[ J]. The new England Journal of Medicine, 2001,345(4) :1594 - 1602.
4Furukawa, T. A. Review: placebo is better than no treatment for subjective continuous outcomes and for treatment of pain[J]. Evidence - Based Mental Heahh,2002,7( 1 ) :11.
5Martin Enserink. Can the Placebo Be the Cure? [ J]. Science,1999,284(5412) :238 -240
6Vickers AJ, Rees RW, Zollman CE, et al. Acupuncture of chronic headache disorders in primary care: randomised controlled trial and economic analysis [ J ]. Health Technol Assess, 2004,8 (48) : 1 -36.