WASH Benefits Bangladesh trial: system for monitoring coverage and quality in an efficacy trial by Mahbubur Rahman, Sania Ashraf, Leanne Unicomb, A. K. M. Mainuddin, Sarker Masud Parvez, Farzana Begum, Kishor Kumar Das, Abu Mohd. Naser, Faruqe Hussain, Thomas Clasen, Stephen P. Luby, Elli Leontsini, Peter J. Winch

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