1. Praxis für Prävention; Rehabilitation und Orthopädie; Bonn Germany
2. Hospital Nacional de Ninos; San Jose Costa Rica
3. Klinikum Bremen-Mitte; Prof.-Hess-Kinderklinik; Bremen Germany
4. Angelo Bianchi Bonomi Hemophilia and Thrombosis Center; Fondazione IRCCS Ca’ Granda; Ospedale Maggiore Policlinico; Milan Italy