McCarthy, Eilis, Muneeb Mustafa, and Mike Watts. “ANCA-Negative Granulomatosis With Polyangiitis: A Difficult Diagnosis”. European Journal of Case Reports in Internal Medicine 4, no. 8 (October 30, 2017). Accessed May 7, 2024. https://www.ejcrim.com/index.php/EJCRIM/article/view/625.