[1] Peoples Hosp Zhengzhou Univ, Dept Neurol, Zhengzhou, Peoples R China
[2] Puyang Peoples Hosp, Dept Neurol, Puyang, Peoples R China
[3] Yishui Cty Peoples Hosp, Dept Neurol, Linyi, Peoples R China
[4] Taishan Vocat Coll Nursing, Dept Basic Med Teaching, Tai An, Peoples R China
[5] Shandong Univ, Cheeloo Coll Med, Sch Publ Hlth, Dept Epidemiol, Jinan, Peoples R China
[6] Shandong Univ, Hosp 2, Cheeloo Coll Med, Dept Neurol, Jinan, Peoples R China
[7] Puyang Peoples Hosp, Dept Oral & Maxillofacial Surg, Puyang, Peoples R China
[8] Lanzhou Univ, Sch Publ Hlth, Dept Publ Hlth, Lanzhou, Peoples R China
[9] Sishui Cty Peoples Hosp, Dept Neurol, Jining, Peoples R China