1. International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka-1212, Bangladesh
2. National Institute of Cholera and Enteric Diseases, Calcutta-700 010, India
3. Center for Southeast Asian Studies, Kyoto University, Yoshida, Sakyo-ku, Kyoto
4. Faculty of Human Life Sciences, Jissen Women’s University, Tokyo 191-8510, Japan