Hung-Pin Lin1, Chung-Ji Liu2, Chun-Pin Chiang3. 1. Department of Dentistry, MacKay Memorial Hospital, Taipei, Taiwan; Department of Medicine, MacKay Medical College, New Taipei City, Taiwan; Department of Dentistry, School of Dentistry, National Taiwan University, Taipei, Taiwan. 2. Department of Oral and Maxillofacial Surgery, MacKay Memorial Hospital, Taipei, Taiwan; Department of Medical Research, MacKay Memorial Hospital, Taipei, Taiwan; Institute of Oral Biology, School of Dentistry, National Yang-Ming University, Taipei, Taiwan. 3. Department of Dentistry, School of Dentistry, National Taiwan University, Taipei, Taiwan; Graduate Institute of Oral Biology and Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University, Taipei, Taiwan; Department of Dentistry, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan. Electronic address: cpchiang@ntu.edu.tw.