Rozin, A. P., J. Pruzansky, Y. Edoute, and A. Balbir-Gurman. “Serum sodium/Potassium Ratio in Patients With Rheumatoid Arthritis and Osteoarthritis”. Rheumatology Reports, Vol. 2, no. 1, July 2010, p. e5, doi:10.4081/rr.2010.e5.