Novitzky-Basso I, Patriquin C, Linn SMar, Chiarello C, Pasic I, Lam W, Law A, Michelis FV, Gerbitz A, Viswabandya A, et al. Propensity score matching analysis comparing the efficacy and steroid tapering benefit of extracorporeal photopheresis to best available therapy in third-line or beyond treatment for chronic GvHD. Transplant Cell Ther. 2023.