1. School of Oral Health Sciences Faculty of Dentistry Kyushu Dental University Fukuoka Japan
2. Department of Oral Hygiene College of Dental Medicine Kaohsiung Medical University, Kaohsiung Kaohsiung Taiwan
3. School of Oral Hygiene College of Oral Medicine Taipei Medical University Taipei Taiwan
4. Faculty of Dentistry Kyushu Dental University Fukuoka Japan