1. Basel Institute for Clinical Epidemiology and Biostatistics; University Hospital Basel; Basel Switzerland
2. Research Department of Infection and Population Health; University College London; London UK
3. Unit of Infectious Diseases; Hospital Sierrallana; Torrelavega Spain
4. Department of Internal Medicine; Division of Infectious Diseases, Center for Infection and Immunity- Amsterdam; Academic Medical Center; Amsterdam The Netherlands
5. National Center of Epidemiology; Carlos III Health Institute; Madrid Spain
6. Center for AIDS Research; University of Washington; Seattle WA USA
7. Infectious Disease Service; The Hospital Clinic of Barcelona; August Pi i Sunyer Biomedical Research Institute; University of Barcelona; Barcelona Spain
8. Clinic of Infectious Diseases and Tropical Medicine; San Paolo Hospital; University of Milan; Milan Italy
9. Division of Infectious Disease; Department of Medicine; University of Alabama; Birmingham AL USA
10. Medical University Innsbruck; Innsbruck Austria
11. Division of Infectious Diseases and Hospital Epidemiology; University Hospital Basel; Basel Switzerland