1. Graduate Institute of Epidemiology and Preventive Medicine; College of Public Health; National Taiwan University; Taipei City Taiwan
2. School of Oral Hygiene; Oral Medicine of College; Taipei Medical University; Taipei City Taiwan
3. Department of Pathology; Tri-Service General Hospital; Taipei City Taiwan
4. Department of Pathology; Graduate Institute of Pathology and Parasitology; National Defense Medical Center; Taipei City Taiwan