1. School of Medicine, Shandong University, Jinan 250000, Shandong, China.
2. Department of Thoracic Surgery, Taian City Central Hospital, Taian 271000, Shandong, China.
3. Department of Thoracic Surgery, Shandong Provincial Hospital affiliated to Shandong University, Jinan 250000, Shandong, China.
4. Department of Gynaecology and Obstetrics, Taian City Central Hospital, Taian 271000, Shandong, China.
5. Taian Vocational College of Nursing, Taian 271000, Shandong, China.