1. Pediatric Infectious Diseases Unit; University Children's Hospital Mannheim; University of Heidelberg; Heidelberg Germany
2. Schaller Research Group at the University of Heidelberg and the DKFZ; Heidelberg Germany
3. Institute of Biochemistry II; Medical Faculty; University of Cologne; Cologne Germany
4. Institute of Nutritional Science; Justus Liebig University Giessen; Giessen Germany