Four-year Duplex Ultrasound Follow-up of Trunk Incompetent Saphenous Veins Treated with High Ligation and Reversed Catheter-directed Foam Sclerotherapy. (December 2019) - Yang, Wen-Cheng; Lin, Yi-Chun; Kung, Chiao-Hsin; Lee, Yun-Ting; Lin, Yu-Shiou; Wu, Ching-Feng; Li, Mingli; Lin, Hui-Han