1. Department of Family Medicine and Community Health, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
2. Department of Public Health, National Defense Medical Center, Neihu, Taipei, Taiwan, ROC
3. Division of Environmental Health and Occupational Medicine, National Health Research Institutes, Kaohsiung, Taiwan, ROC
4. Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
5. Medical Bureau, Department of National Defense, Taipei, Taiwan, ROC