[…] treatment to the head and neck Active hepatitis C infection (confirmed by polymerase chain reaction) AIDS Sarcoidosis Amyloidosis Graft-vs-host disease IgG4-related disease † A focus score is the number of inflammatory infiltrates of at least 50 cells present [merckmanuals.com]

Patients who fulfill the following exclusion criteria do not have primary Sjögren syndrome: History of radiation treatment to the head and neck Active hepatitis C infection (confirmed by polymerase chain reaction) AIDS Sarcoidosis Amyloidosis Graft-vs-host [merckmanuals.com]

CURRENT Diagnosis & Treatment: Rheumatology, 3e New York, NY: McGraw-Hill; 2013. Available online at http://accessmedicine.mhmedical.com/content.aspx?bookid=506§ionid=42584911. Accessed April 07, 2020. Maslinska M. [labtestsonline.it]

Sjögren-Larsson syndrome (SLS) is a chronic autoimmune disease of unknown etiology most commonly seen in women (male/female ratio 1:9) mainly in the fourth and fifth decades of life. [link.springer.com]

The epidemiology of Sjögren's syndrome. Clin Epidemiol. 2014;6:247–255. Published 2014 Jul 30. doi:10.2147/CLEP.S47399. Available online at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4122257/pdf/clep-6-247.pdf. Accessed April 8, 2020. [labtestsonline.it]