Acknowledgements
This study is supported by the PedNet Haemophilia Research foundation and by grants from The Swedish Research Council (2015-02957). Unrestricted sponsorship for the foundation is currently received from: Bayer AG, Novo Nordisk Healthcare AG, Pfizer SRL, CSL Behring GmbH, Swedish Orphan Biovitrium AB, Takeda, Hoffmann La-Roche.
We greatly appreciate the support of the PedNet Foundation staff members, especially Marloes de Kovel and Ella van Hardeveld.