1. School of Public Health, Shandong University, Jinan 250012, China
2. Department of Poisoning and Occupational Diseases, Emergency Medicine, Qilu Hospital of Shandong University, Jinan 250012, China
3. School of Nursing and Rehabilitation, Cheeloo College of Medicine, Shandong University, Jinan 250012, China
4. Department of Geriatric Medicine, Department of Nursing, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250012, China