Witte, Torsten IgG4-related sialadenitis: IgG4 is helpful, but biopsies are still crucial. [electronic resource] - Arthritis research & therapy Dec 2015 - 368 p. digital Publication Type: Editorial ISSN: 1478-6362 Standard No.: 10.1186/s13075-015-0888-7 doi Subjects--Topical Terms: Biomarkers--bloodBiopsyDiagnosis, DifferentialHumansImmunoglobulin G--bloodSialadenitis--blood