1. Department of Pediatric Surgery, Shandong Provincial Hospital, Shandong University, Jinan, Shandong 250021, P.R. China
2. Department of Thoracic Surgery, Shandong Provincial Hospital, Shandong University, Jinan, Shandong 250021, P.R. China
3. Post‑doctoral Research Station of Clinical Medicine, Liaocheng People's Hospital, Jinan, Shandong 252004, P.R. China
4. Department of Dermatology, The First Affiliated Hospital of Shandong First Medical University, Jinan, Shandong 250021, P.R. China