Stacchiotti, S., Frezza, A. M., Blay, J., Baldini, E. H., Bonvalot, S., Bovée, J. V. M. G., Callegaro, D., Casali, P. G., Chiang, R. C., Demetri, G. D., Demicco, E. G., Desai, J., Eriksson, M., Gelderblom, H., George, S., Gounder, M. M., Gronchi, A., Gupta, A., Haas, R. L., Hayes‐Jardon, A., Hohenberger, P., Jones, K. B., Jones, R. L., Kasper, B., Kawai, A., Kirsch, D. G., Kleinerman, E. S., Le Cesne, A., Lim, J., Chirlaque López, M. D., Maestro, R., Marcos‐Gragera, R., Martin Broto, J., Matsuda, T., Mir, O., Patel, S. R., Raut, C. P., Razak, A. R. A., Reed, D. R., Rutkowski, P., Sanfilippo, R. G., Sbaraglia, M., Schaefer, I., Strauss, D. C., Sundby Hall, K., Tap, W. D., Thomas, D. M., van der Graaf, W. T. A., van Houdt, W. J., Visser, O., von Mehren, M., Wagner, A. J., Wilky, B. A., Won, Y., Fletcher, C. D. M., Dei Tos, A. P., & Trama, A. (2021). ultra‐rare sarcomas: A consensus paper from the Connective Tissue Oncology Society community of experts on the incidence threshold and the list of entities. Cancer, 127(16), 2934–2942. http://access.bl.uk/ark:/81055/vdc_100136731359.0x000063