1. Department of medicine, Qingdao University
2. Department of Cardiology, Weifang People's Hospital
3. Department of Stomatology, Weifang Maternal and Child Health Hospital
4. Department of Personnel, Weifang Maternal and Child Health Hospital
5. School of Public Health, Weifang Medical University
6. Department of Cardiology, The Affiliated Hospital of Qingdao University
7. Qingdao University