LAUSR

Second School of Clinical Medicine, Southern Medical University, Guangzhou, China; Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China; Department of Surgery, Khoo Teck Puat Hospital, Singapore, Singapore Contributions: (I) Conception and design: Y Li; (II) Administrative support: The Ethics Committee of Guangdong Provincial People’s Hospital; (III) Provision of study materials or patients: X Feng, D Wu, J Wang, Z Lyv, J Zheng; (IV) Collection and assembly of data: Y Luo, X Feng; (V) Data analysis and interpretation: Y Luo, X Feng; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors. These authors contributed equally to this work. Correspondence to: Yong Li. Department of General Surgery, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China. Email: [email protected].