1. Pharmaceutical Chemistry I,
Pharmaceutical Institute, University of Bonn, 53121 Bonn, Germany
2. Central Institute of the Bundeswehr Medical Service Munich, 85748 Garching-Hochbrück,
Germany
3. Department of Gastrointestinal
Microbiology, German Institute of Human Nutrition Potsdam-Rehbruecke, 14558 Nuthetal, Germany