1. 1st Pediatric Department; Hippokration General Hospital; Aristotle University of Thessaloniki; Thessaloniki Greece
2. Thrombosis and Hemostasis Unit and Haemophilia Treating Centre; Giannina Gaslini Children's Hospital; Genova Italy
3. Department of Paediatrics and Malmö Centre for Haemostasis and Thrombosis; Skåne University Hospital; Lund University; Malmö Sweden