1. Department of Pediatrics, Karl Landsteiner University of Health Sciences, Sankt Pölten, Austria
2. Research and Development, Dr. Willmar Schwabe GmbH & Co. KG, Karlsruhe, Germany
3. Emeritus, Institute of Medical Statistics, Informatics and Epidemiology, University of Cologne, Cologne, Germany
4. Children's Hospital, Evangelic Hospital, Hamm, Germany
5. Faculty of Medicine, Pomeranian Medical University, Szczecin, Poland