Rudén, A.; Bäckman, M.; Bygdeman, S.; Jonsson, A.; Ringertz, O.; Sandström, E. Gonorrhoea in Heterosexual Men. Correlation Between Gonococcal W Serogroup, Chlamydia Trachomatis Infection and Objective Symptoms. Acta Derm Venereol 1986, 66, 453-456.