[1] San Giovanni Battista Hosp, Dept Digest & Colorectal Surg, Ctr Minimal Invas Surg, San Giovanni Rotondo, Italy
[2] Univ Turin, San Giovanni Battista Hosp, Dept Biomed Sci & Human Oncol, I-10124 Turin, Italy
[3] Amedeo di Savoia Hosp, Dept Infect Dis, STI Clin, Turin, Italy
[4] Amedeo di Savoia Hosp, Microbiol & Virol Lab, Turin, Italy
[5] Municipal Hlth Serv Amsterdam GGD Amsterdam, STI Outpatient Clin, Amsterdam, Netherlands
[6] Univ Amsterdam, Acad Med Ctr, Dept Dermatol, NL-1105 AZ Amsterdam, Netherlands
[7] Univ Amsterdam, Acad Med Ctr, CINIMA, NL-1105 AZ Amsterdam, Netherlands
[8] Natl Inst Publ Hlth & Environm, Ctr Infect Dis Control, NL-3720 BA Bilthoven, Netherlands