Conducting clinical trials in sub-Saharan Africa: challenges and lessons learned from the Malawi Cryptosporidium study.

Toto N, Douglas E, Gmeiner M, Barrett LK, Lindblad R, Makhaza L, Nedi W, Phulusa J, Quinnan GV, Sawyer LA, Thole H, Van Voorhis WC, Iroh Tam PY,