1. Klinikum Ernst von Bergmann, Gastroenterology and Infectious Disease, Charlottenstr 72, 14467 Potsdam, Germany
2. GfK Healthcare, Nordwestring 101, 90419 Nurnberg, Germany
3. Sanofi Pasteur MSD, 162 Avenue Jean Jaurès, CS 50712, 69367 Lyon Cedex 07, France