The author would like to thank Jaruwan Mongpraneet, Pantipa Singhakamolphan, Phenluck Lamyai, Suchitra Promsen, and Sutawan wannajak the fourth year medical technology students of Rangsit University 2008, for their technical help. We sincerely thank Chalermpol Promsen for helping in sample collection at Bangkok, Pornthip Rungruang for data preparation, and all migrants recruited in the study for their cooperation. This project was financially supported by Rangsit University. The useful information was kindly obtained from Samut Sakhon Public Health Office and Migrant Health System Development Center.