1. Department of Abdominal Ultrasound, The Affiliated Hospital of Qingdao University, Qingdao, China
2. Department of Thyroid, The Affiliated Hospital of Qingdao University, Qingdao, China
3. Department of Nuclear Medicine, The Affiliated Hospital of Qingdao University, Qingdao, China
4. Health Management Center, The Affiliated Hospital of Qingdao University, Qingdao, China