Genome wide association study of fetal hemoglobin in sickle cell anemia in Tanzania by Mtatiro, SN, Singh, T, Rooks, H, Mgaya, J, Mariki, H, Soka, D, Mmbando, B, Msaki, E, Kolder, I, Thein, S, Menzel, S, Cox, SE, Makani, J, Barrett, J