Kaljee LM, Pach A, Thriemer K, Ley B, Ali SM, Jiddawi M, Puri M, von Seidlein L, Deen J, Ochiai L, Wierzba T, Clemens J. Utilization and accessibility of healthcare on Pemba Island, Tanzania: implications for health outcomes and disease surveillance for typhoid fever. Am J Trop Med Hyg. 2013 Jan; 88(1):144-52.