[1] UICC Asian Reg Off Canc Control, Tokyo, Japan
[2] Natl Canc Ctr, Tokyo 104, Japan
[3] Natl Canc Inst, Bangkok, Thailand
[4] Hanoi Med Univ, Hanoi, Vietnam
[5] Natl Canc Inst, Ha Noi Canc Registry, Hanoi, Vietnam
[6] Khon Kaen Univ, Khon Kaen, Thailand
[7] Prince Songkla Univ, Hat Yai, Thailand
[8] Ho Chi Minh Canc Registry, Ho Chi Minh City, Vietnam