Yi-Min Gu1, Han-Lu Zhang1, Long-Qi Chen2. 1. Department of Thoracic Surgery, West China Hospital of Sichuan University, No. 37, Guoxue Alley, Chengdu, 610041, China. 2. Department of Thoracic Surgery, West China Hospital of Sichuan University, No. 37, Guoxue Alley, Chengdu, 610041, China. drchenlq@scu.edu.cn.