Building research capacity for sickle cell disease in Africa: Lessons and challenges from establishing a birth cohort in Tanzania oleh Siana Nkya, Siana Nkya, Siana Nkya, Belinda J. Njiro, Doreen Ngowi, David Solomon, Frida Kaywanger, Salama Nyangasa, Godfrey Ndoje, Emmanuela Marco, Mazoea Moses, Julie Makani