Safe distances between groundwater-based water wells and pit latrines at different hydrogeological conditions in the Ganges Atrai floodplains of Bangladesh

M. Sirajul Islam, Zahid Hayat Mahmud, M. Shafiqul Islam, Ganesh Chandra Saha, Anwar Zahid, AHM Zulfiquar Ali, M. Qumrul Hassan, Khairul Islam, Hasin Jahan, Yakub Hossain, M. Masud Hasan, Sandy Cairncross, Richard Carter, Stephen P. Luby, Alejandro Cravioto, Hubert Ph. Endtz, Shah M. Faruque, John D. Clemens