1 University of Northern British Columbia, Northern Medical Program, 3333 University Way, Prince George, British Columbia, V2N 4Z9, Canada; University of Victoria, Canadian Institute for Substance Use Research (CISUR), 2300 McKenzie Avenue, Victoria, British Columbia, V8N 5M8, Canada; Centre for Addiction and Mental Health (CAMH), Human Brain Laboratory, 250 College Street, Toronto, Ontario, M5T 1R8, Canada. Electronic address: russ.callaghan@unbc.ca.
2 University of Victoria, Canadian Institute for Substance Use Research (CISUR), 2300 McKenzie Avenue, Victoria, British Columbia, V8N 5M8, Canada.
3 Centre for Addiction and Mental Health (CAMH), Human Brain Laboratory, 250 College Street, Toronto, Ontario, M5T 1R8, Canada.