1. Department of Breast and Thyroid Surgery, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
2. Department of Thyroid and Breast Surgery, Maternal and Child Health Hospital of Hubei Province, Wuhan, Hubei 430070, P.R. China
3. Department of Medical Ultrasonography, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China