Therapeutic effect of psilocybin in addiction : A systematic review - van der Meer, Pim B. (Department of Psychiatry. University Medical Center Utrecht) ; Fuentes, Juan J. (Universitat Autònoma de Barcelona. Departament de Psiquiatria i de Medicina Legal) ; Kaptein, Ad A. (Department of Medical Psychology, Leiden University Medical Center) ; Schoones, Jan W. (Leiden University Medical Center) ; de Waal, Marleen M. (Amsterdam UMC. University Medical Center) ; Goudriaan, Anneke E. (Amsterdam UMC. University Medical Center) ; Kramers, Kees (Department of Pharmacology-Toxicology, Radboud University Medical Center) ; Schellekens, Arnt (Department of Psychiatry, Radboud University Medical Center) ; Somers, Metten (Department of Psychiatry. University Medical Center Utrecht) ; Bossong, Matthijs G. (Department of Psychiatry. University Medical Center Utrecht) ; Batalla, Albert (Department of Psychiatry, University Medical Center Utrecht)