Hoa Phan BichThai Nguyen City Medical Center, Thai Nguyen, VietnamHa Nguyen Thi ThuThai Nguyen Center for Diseases Control, Thai Nguyen, VietnamHieu Nguyen ThiThai Nguyen Center for Diseases Control, Thai Nguyen, VietnamAnh HoangThai Nguyen Center for Diseases Control, Thai Nguyen, Vietnam...