1. Department of Thyroid Surgery, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University , Taiyuan 030032 , Shanxi Province , P.R. China
2. Department of Thyroid Surgery, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University , No. 99 Longcheng Street , Taiyuan 030032 , Shanxi Province , P.R. China