1 Kaohsiung Chang Gung Memorial Hospital, and Chang Gung University College of Medicine, Kaohsiung city, Taiwan.
2 Department of Public Health, Chung Shan Medical University, Taiwan; Department of Family and Community Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan.
3 Changhua Public Health Bureau, Changhua, Taiwan.
4 School of Oral Hygiene, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.
5 Institute of Epidemiology and Preventive Medicine, National Taiwan University, Taipei, Taiwan.
6 Changhua Public Health Bureau, Changhua, Taiwan; Institute of Epidemiology and Preventive Medicine, National Taiwan University, Taipei, Taiwan. Electronic address: yeh.leego@gmail.com.