Karar Ahsan (MEASURE Evaluation, Carolina Population Center, University of North Carolina at Chapel Hill, NC 27517, USA), Peter Streatfield (International Center for Diarrhoeal Disease Research, Bangladesh (icddr,b)), Rashida Ijdi (MEASURE Evaluation, Carolina Population Center, University of North Carolina at Chapel Hill, NC 27517, USA), Gabriela Escudero (MEASURE Evaluation, Carolina Population Center, University of North Carolina at Chapel Hill, NC 27517, USA), Abdul Khan (Program Management & Monitoring Unit, Ministry of Health & Family Welfare, Dhaka 1000, Bangladesh), MM Reza (Program Management & Monitoring Unit, Ministry of Health & Family Welfare, Dhaka 1000, Bangladesh)