1. School of Public Health, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
2. Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt University Medical Center, Nashville, Tennessee
3. School of Medical and Health Sciences, Edith Cowan University, Perth, Australia
4. Taian Maternity and Child Health Hospital, Taian, China
5. School of Public Health, Peking University, Beijing, China
6. Department of Blood Transfusion, The Affiliated Taian City Central Hospital of Qingdao University, Taian, China
7. School of Public Health and The Second Affiliated Hospital of Shandong First Medical University, Taian, China