1. Urology
2. Department of Surgery, Hanoi Medical University, Dong Da District
3. Department of Cardiovascular & Thoracic Surgery, Cardiovascular Center, E Hospital
4. College of Medicine & Pharmacy, Vietnam National University, Cau giay District
5. Department of Surgery, Hai Phong University of Medicine and Pharmacy, Haiphong, Vietnam
6. Department of Gastroenterology-Hepatology-Urology, Vinmec International Hospital, Hai Ba Trung district. Hanoi
7. Coloproctology and Perineology, Viet Duc University Hospital, Hoan Kiem District