1. Department of Internal Medicine, Aker University Hospital, Oslo
2. Unité des Rickettsies, CNRS, UMR 6020 Université de la Mediterranee, Marseille, France
3. Swedish Institute for Infectious Disease Control, Solna, Sweden
4. Department of Preventive Medicine, Oslo
5. Oslo Travel Clinic, Oslo
6. Department of Infectious Diseases, St. Olav's University Hospital, Trondheim
7. Department of Infectious Diseases, Akershus University Hospital, Nordbyhagen, Norway
8. Department of Infectious Diseases, Ullevål University Hospital, Oslo