1. Department of Ultrasound, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
2. Department of Cardiology, Taishan Sanatorium of Shandong Province, Taian, China
3. Outpatient Department, Jinan Central Hospital Affiliated to Shandong University, Jinan, China
4. Department of Thyroid Surgery, Qilu Hospital of Shandong University, Jinan, China