The Cost of Annual versus Biannual Community-Directed Treatment of Onchocerciasis with Ivermectin: Ghana as a Case Study - Turner, HC; Osei-Atweneboana, MY; Walker, M; Tettevi, EJ; Churcher, TS; Asiedu, O; Biritwum, N-K; Basanez, M-G (PLOS NEGLECTED TROPICAL DISEASES, 2013)