Outcomes of patient with lumbar disc herniation undergoing unilateral biportal endoscopic surgery oleh Tran Vu Hoang Duong, Pham Anh Tuan, Truong Van Tri, Pham Quoc Linh, Luu Binh Duong, Le Tan Bao, Huynh Van Vu, Chu Van Lam, Le Tan Linh, Vo Anh Hung, Phan Duy