Filippou, G., Scanu, A., Adinolfi, A., Toscano, C., Gambera, D., Largo, R., Naredo, E., Calvo, E., Herrero-Beaumont, G., Zufferey, P., Bonjour, C. M., MacCarter, D. K., Makman, S., Weber, Z., Figus, F., Möller, I., Gutierrez, M., Pineda, C., Clavijo Cornejo, D., Garcia, H., Ilizaliturri, V., Mendoza Torres, J., Pichardo, R., Rodriguez Delgado, L. C., Filippucci, E., Cipolletta, E., Serban, T., Cirstoiu, C., Vreju, F. A., Grecu, D., Mouterde, G., Govoni, M., Punzi, L., Damjanov, N. S., Keen, H. I., Bruyn, G. A., Terslev, L., D'Agostino, M., Scirè, C. A., & Iagnocco, A. (2021). criterion validity of ultrasound in the identification of calcium pyrophosphate crystal deposits at the knee: an OMERACT ultrasound study. Annals of the rheumatic diseases, 80(2), 261–267. http://access.bl.uk/ark:/81055/vdc_100127574579.0x000063