1. Behavioral Science Area, Institute for Research in Dental Science, Faculty of Dentistry, Universidad de Chile, Santiago 8380544, Chile
2. Department of Psychology, Faculty of Social Sciences, Universidad de Chile, Santiago 7800284, Chile
3. Department of Oral Medicine and Pathology, Faculty of Dentistry, Universidad de Chile, Santiago 8380544, Chile
4. National Association of Sjögren Patients of Chile, Santiago 8320214, Chile
5. Medicine Department, Dental and Maxillofacial Service, Clinical Hospital, Universidad de Chile, Santiago 8380456, Chile