Jennings MC, Tilley DH, Ballard SB, Villanueva M, Costa FM, Lopez M, Steinberg HE, Luna CG, Meza R, Silva ME, Gilman RH, Simons MP, Maves RC, Cabada MM. Case-Case Analysis Using 7 Years of Travelers' Diarrhea Surveillance Data: Preventive and Travel Medicine Applications in Cusco, Peru. Am J Trop Med Hyg. 2017 May; 96(5):1097-1106.