Zaccaria, A., G. Latinakis, M. Oliveri, T. Maio, G. Frisone, and F. Versace. “The Support of the Ultrasonography of the Shoulder in the Diagnosis of Polymyalgia Rheumatica With Normal Erythrocyte Sedimentation Rate”. Reumatismo 61, no. 4 (1): 290-297. Accessed September 28, 2020. https://www.reumatismo.org/index.php/reuma/article/view/reumatismo.2009.290.