1. Department of Thoracic Surgery, Jinan Central Hospital, Jinan, Shandong 250013, P.R. China
2. Department of Thoracic Surgery, Jinan Central Hospital, Shandong University, Jinan, Shandong 250013, P.R. China
3. Department of Ophthamology, Jinan Mingshui Eye Hospital, Jinan, Shandong 250200, P.R. China
4. Department of Thoracic Surgery, Jinan Central Hospital, Shandong First Medical University, Jinan, Shandong 250013, P.R. China