Sirotti, S., et al. “Accuracy of Synovial Fluid Analysis Compared to Histology for the Identification of Calcium Pyrophosphate Crystals: An Ancillary Study of the OMERACT US Working Group - CPPD Subgroup”. Reumatismo, vol. 73, no. 2, Aug. 2021, pp. 106-10, doi:10.4081/reumatismo.2021.1403.