Rick, J., Gould, L. J., Marzano, A. V., Garg, A., Chen, D., Oakes, D. L., Dissemond, J., Herfarth, H., Friedman, M. A., Alavi, A., Yamamoto, T., Gerbens, L. A. A., Thomas, K. S., & Ortega-Loayza, A. G. (2023). The “Understanding Pyoderma Gangrenosum, Review and Assessment of Disease Effects (UPGRADE)” Project: a protocol for the development of the core outcome domain set for trials in pyoderma gangrenosum. Archives of Dermatological Research, 315(4), 983-988. https://doi.org/10.1007/s00403-022-02424-1