1. Institute of Cardiovascular Diseases, Taian Maternal and Child Health Hospital, Taian, Shandong 271000, P.R. China
2. Department of Endocrinology, Peking Union Medical College Hospital, Beijing 100730, P.R. China
3. Department of Neurology, Taishan Medical University, Taian, Shandong 271000, P.R. China