Student's Abstract
Sinith Say1*, Chhorvann Chhea2, Lo Koung3, Prahors Ung4
1- University of Puthtisatra, 2- School of Public Health at the NIPH, 3- Provincial Health Department of Preah Vihear, 4- GIZ-Cambodia
Corresponding author: Say Sinith; Email: say_sinith@yahoo.com