자꾸 까먹어서 여기에 적어 놓아야 겠다. ㅡㅡ Grade Lymphocytes per 4 sq mm of Salivary Tissue 0 Absent 1 Slight infiltrate 2 Moderate infiltrate or less than one focus' 3 One focus 4 More than one focus 'Focus = an aggregate of 50 or more lymphocytes and histiocytes. Reference: Chisholm DM, Mason DK. Labial salivary gland biopsy in Sjogren's disease. J Clin Pathol 1968; 21: 656-60.