Polich, G., Iaccarino, M.A., Kaptchuk, T.J. Morales-Quezada, L. and Zafonte, R. (2018). Placebo effects in traumatic brain injury, Journal of Neurotrauma, 35(11), 1205-1212. doi: 10.1089/neu.2017.5506

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6016098/