1. Department of Internal Medicine, Hospital Universitari Germans Trias i Pujol, Universitat Autònoma de Barcelona, Ctra. Canyet s/n, 08916 Badalona, Spain
2. Municipal Centre for Substance Abuse Treatment (Centro Delta), IMSP-Badalona, C/Termes Romanes 12, 08911 Badalona, Spain
3. 3Department of Internal Medicine, Alcoholism Unit, Hospital Universitario de Salamanca, Paseo de San Vicente, 88-182, 37007 Salamanca, Spain