1. Kath. Krankenhaus Hagen, Hagen, Germany
2. Klinikum Bogenhausen, München, Germany
3. Jagiellonian University Medical College, Krakow, Poland
4. Royal London Hospital, London, UK
5. Royal Hospital for Children, Glasgow, UK
6. Villafranca del Hospital Universitario de Basurto, Bilbao, Spain
7. Canberra Hospital, Canberra, Australia
8. Cabinet Medical Créteil, Paris, France
9. Cochin Hospital, Paris, France
10. CHU Dinant-Godinne, Yvoir, Belgium
11. Triemli Hospital, Zürich, Switzerland
12. Univerity and Medical School of Ioannina, Ioannina, Greece
13. Hospital Universitari Germans Trias i Pujol, Badalona, and CIBEREHD, Madrid, Spain