Injection of anabolic steroids in men who had sex with men in madrid and barcelona : Prevalence correlates and role as a risk factor for transmitted infections - Guerras, J.M. (Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública) ; Hoyos, J. (Universidad Complutense de Madrid. Departamento de Salud Pública y Materno-Infantil) ; de la Fuente Galán, Luis (Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública) ; Román, F. (Agència de Salut Pública de Barcelona) ; Ayerdi, Oskar (Instituto de Investigación Sanitaria del Hospital Clínico San Carlos) ; García-Pérez, J.N. (Hospital Universitari Vall d'Hebron) ; García de Olalla, Patricia (Institut d'Investigació Biomèdica Sant Pau) ; Belza, María José (Instituto de Salud Carlos III)
 
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