1 International Organization for Migration (IOM), IOM Headquarters, PO Box 17, CH-1211 Geneva 19, Switzerland. Electronic address: kwickramage@iom.int.
2 Tropical Disease Research Unit, Faculty of Medicine and Allied Sciences, Rajarata University of Sri Lanka, Mihintale, Sri Lanka.
3 International Organization for Migration (IOM), IOM Headquarters, PO Box 17, CH-1211 Geneva 19, Switzerland.
4 International Organization for Migration, Sri Lanka, Colombo, Sri Lanka.