[1] Univ Chile, Inst Res Dent Sci, Fac Dent, Behav Sci Area, Santiago 8380544, Chile
[2] Univ Chile, Fac Social Sci, Dept Psychol, Santiago 7800284, Chile
[3] Univ Chile, Fac Dent, Dept Oral Med & Pathol, Santiago 8380544, Chile
[4] Natl Assoc Sjogren Patients Chile, Santiago 8320214, Chile
[5] Univ Chile, Clin Hosp, Dent & Maxillofacial Serv, Med Dept, Santiago 8380456, Chile