1. Plastic, Reconstructive, Esthetic and Hand Surgery, Centre Hospitalier Universitaire Vaudevoise, Rue du Bugnon 46, 1011 Lausanne, Switzerland
2. Anesthesiology Service, Ente Ospedaliero Cantonale, Via Tesserete 46, 6900 Lugano, Switzerland
3. Paediatric Orthopaedics, Hopital Universitaire Geneve, Rue Gabrielle-Perret Gentil 4, 1205 Geneva, Switzerland
4. Childrens Orthopaedics, Universitäts Kinderspital Beider Basel, Spitalstrasse 33, 4056 Basel, Switzerland
5. Plastic, Reconstructive, Esthetic and Hand Surgery, University Hospital Basel, Spitalstr. 21, 4031 Basel, Switzerland