Authors
Yuwadee Leelukkanaveer
Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University,, Bangkok, Thailand
Pornchai Sithisarankul
Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University,, Bangkok, Thailand
Narin Hirunsutthikul
Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University,, Bangkok, Thailand