[1] University Hospital Zurich,Dept. of Medicine
[2] University Hospital Zurich,Division of Infectious Diseases and Hospital Epidemiology
[3] University Hospital Zurich,Institute of Diagnostic Radiology
[4] University Hospital Zurich,Dept. of Medicine
[5] Hôpitaux Universitaires de Genève,Service d’immunologie et d’allergologie, Département de médecine interne