1. Department of Medical Research, MacKay Memorial Hospital No. 92, Sec. 2, Chung San N. Rd., Taipei 10449, Taiwan
2. Institute of Oral Biology, School of Dentistry, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
3. Department of Stomatology, Taipei Veterans General Hospital, Taipei 11121, Taiwan
4. Department of Oral and Maxillofacial Surgery, Taipei MacKay Memorial Hospital, Taipei 10449, Taiwan