Longitudinal Assessment of Joint Health in Paediatric Haemophilia Using the HEAD-US Ultrasound Scoring System: The ULTRA Study. - Michalopoulou, Aikaterini; Papakonstantinou, Olympia; Dettoraki, Athina; Syrengelas, Dimitrios; Bizimi, Vassiliki; Dakou, Konstantina; Kyprianou, Miltiades; Spoulou, Vassiliki; Pergantou, Helen; Kanaka-Gantenbein, Christina (Life (2075-1729), 2026)