1. Department of Dermatology and AllergologyUniversity Hospital Bonn Bonn Germany
2. Institute for Medical Microbiology, Immunology and ParasitologyUniversity Hospital Bonn Bonn Germany
3. Department of General, Visceral, Thorax and Vascular SurgeryUniversity Hospital Bonn Bonn Germany
4. Institute for Hygiene and Public HealthUniversity Hospital Bonn Bonn Germany