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^ Benedetti F, Amanzio M, Baldi S, Casadio C, Cavallo A, Mancuso M, Ruffini E, Oliaro A, Maggi G (1998). "The specific effects of prior opioid exposure on placebo analgesia and placebo respiratory depression". Pain 75 (2-3): 313–9. doi:10.1016/S0304-3959(98)00010-4PMID: 9583767
Linde K, Witt CM, Streng A, Weidenhammer W, Wagenpfeil S, Brinkhaus B, Willich SN, Melchart D «The effect of patient expectations on outcomes in four randomized controlled trials of acupuncture in patients with chronic pain». Pain, 128, 3, 2007, pàg. 264–71. DOI: 10.1016/j.pain.2006.12.006. PMID: 17257756.
Bausell RB, Lao L, Bergman S, Lee WL, Berman BM «Is acupuncture analgesia an expectancy effect? Preliminary evidence based on participants' perceived assignments in two placebo-controlled trials». Eval Health Prof., 28, 1, 2005, pàg. 9–26. DOI: 10.1177/0163278704273081. PMID: 15677384.
Craggs JG, Price DD, Verne GN, Perlstein WM, Robinson MM «Functional brain interactions that serve cognitive-affective processing during pain and placebo analgesia». Neuroimage, 38, 4, 2007, pàg. 720–9. DOI: 10.1016/j.neuroimage.2007.07.057. PMC: 2100389. PMID: 17904390.
de la Fuente-Fernández R, Ruth TJ, Sossi V, Schulzer M, Calne DB, Stoessl AJ «Expectation and dopamine release: mechanism of the placebo effect in Parkinson's disease». Science, 293, 5532, 2001, pàg. 1164–6. DOI: 10.1126/science.1060937. PMID: 11498597.
Haltia LT, Rinne JO, Helin S, Parkkola R, Någren K, Kaasinen V «Effects of intravenous placebo with glucose expectation on human basal ganglia dopaminergic function». Synapse, 62, 9, 2008, pàg. 682–8. DOI: 10.1002/syn.20541. PMID: 18566972.
Volkow ND, Wang GJ, Ma Y, Fowler JS, Wong C, Jayne M, Telang F, Swanson JM «Effects of expectation on the brain metabolic responses to methylphenidate and to its placebo in non-drug abusing subjects». Neuroimage, 32, 4, 2006, pàg. 1782–92. DOI: 10.1016/j.neuroimage.2006.04.192. PMID: 16757181.
Eippert F, Finsterbusch J, Bingel U, Büchel1 C «Direct evidence for spinal cord involvement in placebo analgesia». Science, 326, 5951, 2009, pàg. 404. DOI: 10.1126/science.1180142. PMID: 19833962.