1. Department of Endocrinology and Metabolism, Institute of Endocrinology, Liaoning Provincial Key Laboratory of Endocrine Diseases, First Affiliated Hospital of China Medical University, Shenyang, Liaoning Province, People's Republic of China.
2. Department of Thyroid Surgery, Institute of Endocrinology, Liaoning Provincial Key Laboratory of Endocrine Diseases, First Affiliated Hospital of China Medical University, Shenyang, Liaoning Province, People's Republic of China.