Waleed HASSAN, et al. “Urinary Soluble Alpha Chain of the Interleukin-2 Receptor As a Biomarker of Active Lupus Nephritis in Egyptian Children With Juvenile Systemic Lupus Erythematosus”. Archives of Rheumatology, vol. 36, no. 1, Mar. 2021, pp. 047-55, doi:10.46497/ArchRheumatol.2021.8001.