Rozin, Alexander P., Josef Pruzansky, Yeouda Edoute, and Alexandra Balbir-Gurman. “Serum sodium/Potassium Ratio in Patients With Rheumatoid Arthritis and Osteoarthritis”. Rheumatology Reports 2, no. 1 (July 13, 2010): e5. Accessed September 26, 2020. https://www.pagepress.org/journals/index.php/rr/article/view/rr.2010.e5.