Institute of Population Health Sciences, National Health Research Institutes, Zhunan, Taiwan Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA Hope Doctors Hospital, Miaoli Puzi Hospital, Ministry of Health and Welfare, Chiayi Yee Zen General Hospital, Taoyuan Department of Family Medicine, Changhua Christian Hospital, Changhua Family Medicine, Community Health Department, Mennonite Christian Hospital, Hualien Department of Surgery, Yuan's General Hospital, Kaohsiung Department of Neurology, Shin Kong Wu Ho Su Memorial Hospital, Taipei College of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan Division of Cancer Epidemiology, Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, USA.