1. Department of Gastrointestinal Microbiology; German Institute of Human Nutrition Potsdam-Rehbruecke; Arthur-Scheunert-Allee 114-116 Nuthetal D-14558 Germany
2. Analytics Group; German Institute of Human Nutrition Potsdam-Rehbruecke; Arthur-Scheunert-Allee 114-116 Nuthetal D-14558 Germany