Documents Savoirs Allelic and genotypic associations of DRD2 TaqI A polymorphism with heroin dependence in Spanish subjects: a case control study Baiget Montserrat, Trujols Joan, Sinol Nuria, Volpini Victor, Banuls Enrique, Calafell Francesc, Luquero Elena, Alvarez Enric, Del, Alvarez, Perez