A comprehensive review of the placebo effect: recent advances and current thought.

By Donald D. Price, D. Finniss, F. Benedetti. Annual Review of Psychology, 2008

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Placebo Effects: Biological, Clinical and Ethical Advances (2010, positive): “Furthermore, a traditional focus on the “inert” content of a placebo has led to difficulties in defining and understanding placebo effects (7,8), let alone applying them in a clinical research and practice (9).”
Activation of the opioidergic descending pain control system underlies placebo analgesia. (2009, background): “…effects are ubiquitous in modern medicine, not only as a control in randomized controlled trials but also as a subject of intense study in diverse clinical fields, such as Parkinson’s disease, depression, immune function, and pain (Benedetti et al., 2005; Enck et al., 2008; Price et al., 2008).”
How important are the common factors in psychotherapy? An update (2015, background): “A summary of this literature is beyond the scope of this article, but many excellent reviews are available (8,27,28).”