1. AIDS Prevention and Research Center, Institute of Public Health, National Yang-Ming University, Taipei, Taiwan
2. Wanhua District Health Center, Taipei City Government, Taipei, Taiwan
3. Institute of Biomedical Science, Academia Sinica, Taipei, Taiwan
4. National Health Research Institutes, Zhunan Township, Miaoli County, Taiwan
5. Center for Disease Control, Department of Health, Republic of China Executive Yuan, Taipei, Taiwan
6. Division of Clinical Virology, Department of Pathology and Laboratory Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
7. Division for Disease Control, Taipei City Hospital, Taipei, Taiwan