1. Pediatric Palliative Care Service, Dr. von Haunersches Kinderspital, Ludwig-Maximilians-University, Munich, Germany.
2. Department of Palliative Medicine, Ludwig-Maximilians-University, Munich, Germany.
3. Service de Soins Palliatifs, Centre Hospitalier Universitaire Vaudois (CHUV), University of Lausanne, Switzerland.