1. Bavarian Health and Food Safety Authority, Oberschleißheim, Germany
2. Department of Pediatrics, University of Erlangen-Nürnberg, Erlangen, Germany
3. Department of Pediatrics, Technical University Munich (TUM), Munich, Germany
4. Department of Pediatrics, Ludwig-Maximilians-University Munich (LMU), Munich, Germany
5. Department of Pediatrics, University of Zurich, Zurich, Switzerland