School of Public Health Cheeloo College of Medicine Shandong University Jinan China;
College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao China;
School of Public Health Cheeloo College of Medicine Shandong University Jinan China;
Hunan University Changsha China;
Stella Maris Polytechnic University Monrovia Liberia;
Cholera; Sub-Saharan Africa; Risk Factors; Improved Water; Hygiene Services;