1. Thien Hanh Hospital, Buon Ma Thuot, Vietnam
2. The University of Danang, Da Nang, Vietnam
3. Da Nang Oncology Hospital, Da Nang, Vietnam
4. Hue University of Medicine and Pharmacy, Hue, Vietnam
5. Savannakhet Medical-Diagnostic Center, Kaysone Phomvihane, Lao People’s Democratic Republic
6. Hue Central Hospital, Hue, Vietnam