Voog, E, A Bolmstedt, S Olofsson, W Ryd, and G B Löwhagen. 1995. “Human Papilloma Virus Infection Among Women Attending an STD Clinic Correlated to Reason for Attending, Presence of Clinical Signs, Concomitant Infections and Abnormal Cytology”. Acta Dermato-Venereologica 75 (1):75-78. https://doi.org/10.2340/00015555757578.