1. School of Public Health, Shandong First Medical University and Shandong Academy of Medical Sciences, Taian, China.
2. Beijing Key Laboratory of Clinical Epidemiology, School of Public Health, Capital Medical University, Beijing, China.
3. School of Medical and Health Sciences, Edith Cowan University, Perth, Western Australia, Australia.
4. School of Public Health and Management, Binzhou Medical University, Yantai, China.