References
- Hrôbjartsson A. Placeboeffekten i lægevitenskab og klinik. In: Andersen L, Claësson M, Hròbjartsson A, Sørensen A (eds) Placebo. Historie, biologi og effekt. Denmark: Akademisk Forlag, 1997:11–67 [in Danish]
- Clark PJ, Leaverton PE. Scientific and ethical issues in the use of placebo controls in clinical trials. Annu Rev Health 1994; 15:19–38
- Beecher HK. The powerful placebo. JAMA 1955; 159:1602–6
- Sher L. The placebo effect on mood and behavior: the role of the endogenous opioid system. Med Hypotheses 1997; 48:347–9
- Straus JL, von Ammon Cavanaugh S. Placebo effects. Issues for clinical practice in psychiatry and medicine. Psychosomatics 1996; 37:315–26
- Turner JA, Deyo RA, Loeser JD, Von Korff M, Fordyce WE. The importance of placebo effects in pain treatment and research. JAMA 1994; 271:1609–14
- Buckalew LW, Coffield KE. An investigation of drug expectancy as a function of capsule colour, size and preparation form. J Clin Psychopharmacol 1982; 2:245–8
- Skovlund E. Should we tell trial patients that they might receive placebo? Lancet 1991; 337:1041
- Desharnais R, Jobin J, Côté C, Lévesque L, Godin G. Aerobic exercise and the placebo effect: a controlled study. Psychosom Med 1993; 55:149–54
- Montgomery GH, Kirsch I. Classical conditioning and the placebo effect. Pain 1997; 72:107–13
- Deyo RA, Walsh NE, Schoenfeld LS, Ramamurthy S. Can trials of physical treatments be blinded? Am J Phys Med Rehabil 1990; 69:6–11