1. Department of Periodontology; School of Dentistry; National Defense Medical Center and Tri-Service General Hospital; Taipei Taiwan
2. Department of Dentistry; Buddhist TZU CHI General Hospital, Taipei Branch; Taipei Taiwan
3. Department of Oral Hygiene; China Medical University; Taichung Taiwan
4. Department of Otolaryngology-Head and Neck Surgery; National Defense Medical Center and Tri-Service General Hospital; Taipei Taiwan