Saify, K., and M. Saadat. “Association Between VNTR Polymorphism in Promoter Region of Prodynorphin (PDYN) Gene and Methamphetamine Dependence”. Open Access Macedonian Journal of Medical Sciences, vol. 3, no. 3, June 2015, pp. 371-3, doi:10.3889/oamjms.2015.079.