1. Department of Radiation Oncology, Dong Nai General Hospital , Bien Hoa , 810000 , Vietnam
2. Faculty of Physics & Engineering Physics , VNUHCM - University of Science , Ho Chi Minh , 749000 , Vietnam
3. Faculty of Medicine , Nguyen Tat Thanh University , Ho Chi Minh , 702000 , Vietnam
4. Chi Anh Medical Technology Co., Ltd. , Ho Chi Minh , 717066 , Vietnam