1 Division of Pediatric Dentistry, Department of Orthodontics and Pediatric Dentistry, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand.
2 Dentaland Clinic, Chiang Mai, Thailand.
3 Department of Anatomy and Cell Biology, University of Michigan, Ann Arbor, Michigan, USA.
4 Division of Pediatric Dermatology, Department of Pediatrics, Chiang Mai University, Chiang Mai, Thailand.