Part 4: Oral/poster AB162. Genes variation in three families of Vietnamese dioxin victim Nguyen Dang Ton, Nguyen Hai Ha, Vu Phuong Nhung, Pham Nhat Khoi, Nguyen Thuy Duong, Huynh Thi Thu Hue, Le Thi Thu Hien, Nguyen Huy Hoang, Nong Van Hai