[1] Shandong Univ, Cheeloo Coll Med, Dept Poisoning & Occupat Dis, Emergency Med,Qilu Hosp, Jinan 250012, Shandong, Peoples R China
[2] Shandong Univ, Cheeloo Coll Med, Sch Publ Hlth, Jinan 250012, Shandong, Peoples R China
[3] Shandong Univ, Cheeloo Coll Med, Sch Nursing & Rehabil, Jinan 250012, Shandong, Peoples R China
[4] Shandong Univ, Qilu Hosp, Cheeloo Coll Med, Dept Geriatr Med, Jinan 250012, Shandong, Peoples R China