1. Medical University of Graz, Department of Internal Medicine, Division of Infectious Diseases , Graz, Steiermark , Austria
2. University Hospital Cologne , Cologne, Germany, Cologne, Nordrhein-Westfalen , Germany
3. CHU de Rennes , Rennes, France, Rennes, Bretagne , France
4. Statens Serum Institut , Copenhagen, Hovedstaden , Denmark
5. St Georges University Hospital , London, United Kingdom, London, England , United Kingdom
6. Hacettepe University , Infectious Diseases and Clinical Microbiology, Ankara, Turkey, Ankara, Ankara , Turkey
7. University of Cologne, Faculty of Medicine and University Hospital Cologne , Cologne, Nordrhein-Westfalen , Germany