Student's Abstract
Kong Chhorvyvann1,2, Chhea Chhorvann2, Yenn Roumany3, Heng Sotheara2
1 Khmer Chinese Friendship Hospital Preah Kosamak,
2 School of Public Health at NIPH
3 Khmer Soviet Friendship Hospital
*Corresponding author: Kong Chhorvyvann: chhorvyvann69@gmail.com