Acute Psychotropic Effects of Oral Cannabis Extract with a Defined Content of Δ9-Tetrahydrocannabinol (THC) in Healthy Volunteers - Kaufmann, R. M.; Kraft, B.; Frey, R.; Winkler, D.; Weiszenbichler, S.; Bäcker, C.; Kasper, S.; Kress, H. G. (Pharmacopsychiatry, 2010)