1. Department of Medical Ultrasound, Shanghai Tenth People’s
Hospital, and §Thyroid Institute, Tongji University School of Medicine, 301 Yan-chang-zhong
Road, Shanghai, 200072, P. R. China
2. State Key Laboratory of High Performance
Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding-Xi Road, Shanghai 200050, P. R. China