District Health Center of Vu Thu District, Thái Bình, Thai Binh, Vietnam
Hanoi Medical University, Hanoi, Vietnam
Pasteur Institute, Ho Chi Minh City, Ho Chi Minh City, Vietnam
Phase 3: Hai Phong Provincial Preventive Medicine Center, Haiphong, Hai Phong, Vietnam
Phase 2 & 3: Khanh Hoa Provincial Health Department, Nha Trang, Khanh Hoa, Vietnam
Hung Ha District Health Center, Thai Binh, Thai Binh Province, Vietnam
Ben Luc Health Center, Bến Lức, Long An Province, Vietnam