[1] Jiangsu Vocat Coll Med, Coll Med Technol, Yancheng, Jiangsu, Peoples R China
[2] Henan Univ CM, Dept Cardiovasc, Affiliated Hosp 1, Zhengzhou, Henan, Peoples R China
[3] Suzhou Ruihua Hosp, Dept Obstet & Gynecol, Suzhou, Jiangsu, Peoples R China
[4] Huazhong Univ Sci & Technol, Tongji Hosp, Tongji Med Coll, Dept Geriatr, Wuhan, Peoples R China
[5] Jiangsu Vocat Coll Med, Dept Med Coll, 283 South Jiefang Rd, Yancheng, Jiangsu, Peoples R China