John WS, Martin TJ, Solingapuram Sai KK, Nader SH, Gage HD, Mintz A, Nader MA. Chronic ?9-THC in Rhesus Monkeys: Effects on Cognitive Performance and Dopamine D2/D3 Receptor Availability. J Pharmacol Exp Ther. 2018 02; 364(2):300-310.