Characterising demographics, knowledge, practices and clinical care among patients attending sickle cell disease clinics in Eastern Uganda by Olupot-Olupot, P, Wabwire, H, Ndila, C, Adong, R, Ochen, L, Amorut, D, Abongo, G, Okalebo, CB, Akello, SR, Oketcho, JB, Okiror, W, Asio, S, Odiit, A, Alaroker, F, Nyutu, G, Maitland, K, Williams, TN