1. Municipal Centre for Substance Abuse Treatment (Centro Delta) ; IMSP Badalona; Badalona; Spain
2. Department of Internal Medicine ; Hospital Universitari Germans Trias i Pujol; Universitat Autònoma Barcelona; Badalona; Spain
3. Department of Internal Medicine ; Hospital Universitari de Bellvitge; L'Hospitalet de Llobregat; Universitat de Barcelona; Barcelona; Spain
4. Institute of Neuropsychiatry & Addictions ; Parc de Salut Mar; Universitat Autònoma Barcelona; Barcelona; Spain