1. Hemophilia Work Group; Beijing Children's Hospital affiliated to Capital Medical University; Beijing; China
2. Hemophilia Center; Nanfang Hospital affiliated to Nanfang Medical University; Guangzhou; China
3. Hemophilia Center of Shandong Province; Jinan; China
4. University of Ottawa; Children's Hospital of Eastern Ontario; Ottawa; ON; Canada
5. Foothills Hospital; University of Calgary; Calgary; AB; Canada