Acknowledgements
The authors express their sincere thanks to the
Thai Research Funds (TRF) and the World Health
Organization (WHO), Thailand, for their financial
support. They also thank Mr Chawalit
Tantinimitkul of WHO for his kindness. All data
support was kindly provided by the Office of
Disease Prevention and Control Department 7
(DPC), Ubon Ratchathani. Thanks also go to
Bob Tremayne, Division of International
Cooperation, Ubon Rajathanee University
(UBU), for his English language assistance.
Finally, our appreciation goes to Mr Wacharapong
Saengnill, College of Medicine and Public
Health, UBU, for his technical support