1. Division of Research and Treatment for Oral and Maxillofacial Congenital Anomalies, Aichi Gakuin University, 2–11 Suemori-dori, Chikusa-ku, Nagoya 464-8651, Japan
2. Odonto-Maxillo Facial Hospital of Ho Chi Minh City, 263-265 Tran Hung Dao Street, District 1, Ho Chi Minh City 71000, Vietnam
3. Cleft Lip and Palate Center, Aichi Gakuin Dental Hospital, 2-11 Suemori-dori, Chikusa-ku, Nagoya 464-8651, Japan
4. Division of Speech, Hearing, and Language, Aichi Gakuin Dental Hospital, 2-11 Suemori-dori, Chikusa-ku, Nagoya 464-8651, Japan
5. School of Odonto-Stomatology, Hanoi Medical University, Hanoi 10000, Vietnam
6. Advanced Research Promotion Center, Health Sciences University of Hokkaido, Ishikari-Tobetsu 061-0293, Japan