Ruman M Zakaria Salam (International Center for Diarrhoeal Disease Research, Bangladesh (icddr,b)), Syed Jafar Raza Rizvi (International Center for Diarrhoeal Disease Research, Bangladesh (icddr,b)), Shakil Ahmed (International Center for Diarrhoeal Disease Research, Bangladesh (icddr,b)), Rubana Islam (International Center for Diarrhoeal Disease Research, Bangladesh (icddr,b)), Md. Rahenul Islam (International Center for Diarrhoeal Disease Research, Bangladesh (icddr,b)), Nibras Ar Rakib (International Center for Diarrhoeal Disease Research, Bangladesh (icddr,b)), Alayne Adams (International Center for Diarrhoeal Disease Research, Bangladesh (icddr,b))