1. Institute of Oral Biology, School of Dentistry, National Yang-Ming University, and Research and Diagnostic Center, Centers for Disease Control, Taipei, Taiwan.
2. Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University, Taipei, Taiwan.
3. Institute of Oral Biology, School of Dentistry, National Yang-Ming University, Taipei, Taiwan.
4. Centers for Disease Control, Taipei, Taiwan.
5. Research and Diagnostic Center, Centers for Disease Control, Taipei, Taiwan.