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Enrollment flowchart of the study patients. Abbreviations: SS, Sjögren’s syndrome; RFCIP, Registry for Catastrophic Illness Patients; LHID2000, Longitudinal Health Insurance Database 2000; CRS, chronic rhinosinusitis; NPX, nasopharynx; HIV, human immunodeficiency virus; AIDS, acquired immune deficiency syndrome; NSD, nasal septal deviation.
