J. Kamarashev, C. Riess, J. Mosimann, and S. Läuchli, “Lymphogranuloma venereum in Zurich Switzerland: Chlamydia trachomatis serovar L2 proctitis among men who have sex with men”, Swiss Med Wkly, vol. 140, no. 1314, pp. 209–209, Apr. 2010.