title: [--what is the lesson?].
authors.forename: Robert
authors.initials: R
authors.lastname: Zangerle
mesh_terms: D004196:Disease Outbreaks / Q000517:prevention & control* / Q000706:statistics & numerical data*; D005060:Europe / Q000453:epidemiology; D006716:Homosexuality; D006801:Humans; D015994:Incidence; D038622:Internationality; D008219:Lymphogranuloma Venereum / Q000175:diagnosis* / Q000453:epidemiology* / Q000628:therapy