1 Graduate Institute of Biomedical Informatics, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan, ROC.
2 School of Public Health, Taipei Medical University, Taipei, Taiwan, ROC.
3 Graduate Institute of Biomedical Informatics, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan, ROC; Ministry of Health and Welfare, Taiwan, ROC. Electronic address: ccnsdoctor@mohw.gov.tw.