1. Research Institute of Advanced Oral Science, Aichi-Gakuin University, Nagoya, Japan, Department of International Community Health, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
2. Department of International Community Health, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
3. Department of Oral and Maxillofacial Surgery, Aichi-Gakuin University, Nagoya, Japan.
4. Department of Oral and Maxillofacial Surgery, Cleft Lip and Palate Center, Aichi-Gakuin University, Nagoya, Japan.
5. Department of Maxillofacial Surgery, Saga University, Saga, Japan.
6. Department of Oral and Maxillofacial Surgery, Nguyen Dinh Chieu Hospital, Ben Tre province, Vietnam.
7. Department of International Community Health, Graduate School of Medicine, University of Tokyo, Tokyo, Japan