Kevin P Hill1, Matthew D Palastro2, Tony P George3. 1. Division of Addiction Psychiatry, Harvard Medical School, Boston, MA, USA; Israel Deaconess Medical Center, Boston, MA, USA. Electronic address: khill1@bidmc.harvard.edu. 2. New York Medical College, Valhalla, NY, USA. 3. Department of Psychiatry, University of Toronto, Toronto, ON, Canada; Addictions Division, Centre for Addiction and Mental Health, Toronto, ON, Canada.