1 Graduate School of Qingdao University Medical College, Qingdao University, Qingdao, Shandong, China.
2 Department of Breast Surgery, Center of General Surgery, Qingdao Hospital, University of Health and Rehabilitation Sciences (Qingdao Municipal Hospital), Qingdao, Shandong, China.
3 Department of Gastrointestinal Surgery, Center of General Surgery, Qingdao Hospital, University of Health and Rehabilitation Sciences (Qingdao Municipal Hospital), Qingdao, Shandong, China.
4 Department of Breast Surgery, Center of General Surgery, Qingdao Hospital, University of Health and Rehabilitation Sciences (Qingdao Municipal Hospital), Qingdao, Shandong, China. Electronic address: [email protected].