Emma Das-Gupta, Hildegard Greinix, Ryan Jacobs, Li Zhou, Bipin N. Savani, Brian G. Engelhardt, Adetola Kassim, Nina Worel, Robert Knobler, Nigel Russell, Madan Jagasia. Extracorporeal photopheresis as second-line treatment for acute graft-versus-host disease: impact on six-month freedom from treatment failure. Haematologica 2014;99(11):1746-1752; https://doi.org/10.3324/haematol.2014.108217.