β-globin gene cluster haplotypes in a cohort of 221 children with sickle cell anemia or Sβ0-thalassemia and their association with clinical and hematological features - Belisário, A R; Martins, M L; Brito, A MS; Rodrigues, C V; Silva, C M; Viana, M B (Acta Haematol, 2010)