1. Department of General Surgery, The Central Hospital of Yishui, Linyi, China
2. Department of Blood Transfusion, Yantai Yu-huang-ding Hospital, Yantai, China
3. Department of Blood transfusion, People’s Hospital of Weifang, Weifang, China
4. Department of Thyroid Surgery, The Affiliated Hospital of Qingdao University, Qingdao, China