1. Microbiology and Infection Control; Statens Serum Institut; Copenhagen Denmark
2. Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico; Milan Italy
3. Moscow Scientific and Practical Centre of Dermatovenereology and Cosmetology; Moscow Russia
4. Olafia Clinic; Oslo University Hospital; Institute of Medicine; University of Oslo; Oslo Norway