1. Department of International Health, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki City, 852-8523, Japan.
2. Department of Geography, Virginia Tech, Blacksburg, United States of America.
3. Department of Mathematical Sciences and Technology, Norwegian University of Life Sciences, Ås, Norway.
4. Local Government Engineering Department, Sher-e-Bangla Nagar, Dhaka, Bangladesh.