1. Department of Paediatric Surgery, and Universitätsmedizin Mainz der Johannes-Gutenberg-Universität, Mainz, Germany.
2. Department of Neurosurgical Pathophysiology, Universitätsmedizin Mainz der Johannes-Gutenberg-Universität, Mainz, Germany.
3. Division of Pediatric Surgery, University of California, San Francisco, California.