Somchai Jadsri* , Pratap Singhasivanon* , Jaranit Kaewkungwal* , Rattana Sithiprasasna* , Somkiat Siriruttanapruk* and Supawadee Konchom*
International Journal of Health Geographics 2006, 5:48doi:10.1186/1476-072X-5-48