1. Department of Radiology Thien Hanh Hospital Buon Ma Thuot Vietnam
2. Department of Radiology Hue University of Medicine and Pharmacy Hue Vietnam
3. Department of Radiology Hue Central Hospital Hue Vietnam
4. Department of Radiology Da Nang Oncology Hospital Da Nang Vietnam
5. Department of Radiology Savannakhet Medical‐Diagnostic Center Kaysone Phomvihane Lao People's Democratic Republic