P118: THE ROLE OF HEMOGLOBIN AND HEMOLYSIS ON TRANSCRANIAL DOPPLER VELOCITIES IN CHILDREN WITH SICKLE CELL DISEASE: DATA FROM A NATURAL HISTORY COHORT. (31st January 2022) - Reggiani, G; Coppadoro, B; Munaretto, V; Manara, R; Baracchini, C; Pieroni, A; Viaro, F; Agodoa, I; Beaubrun, A; Biffi, A; Sainati, L; Colombatti, R