1 Division of Haemostaseology, Medical Department I, University Hospital Leipzig, Leipzig, Germany.
2 Internal Medicine, German Diagnostic Clinic, Wiesbaden, Germany.
3 IPFW (Institute for Paediatric Research and Further Education) and Haemophilia Treatment Centre for Children and Adolescents (Gerinnungszentrum Süd), Blaubeuren, Germany.
4 Paediatric Haemophilia Centre, University Hospital Frankfurt, Goethe University Frankfurt, Frankfurt, Germany.
5 Health Department of the City of Dresden, Vaccination Centre, Dresden, Germany.
6 Paediatric Haemophilia Centre, Dr. von Hauner Children's Hospital, LMU Munich, Munich, Germany.