1. Department of Oral Biology, Faculty of Dentistry, Universitas Padjadjaran, Jatinangor, West Java, Indonesia
2. Smile Train, New York City, New York, USA
3. Centre for Epidemiologic Studies, Utah State University, Logan, Utah, USA
4. Division of Oral Health Sciences and WHO Collaborating Centre for Oral Health & Craniofacial Anomalies, University of Dundee, Dundee, Scotland, UK