MG Silva, L Ferreira Neto, A Guimaraes, A Machado, A Parreira and M Abecasis (2005) “Long-term follow-up of lymphocyte populations and cellular cytokine production in patients with chronic graft-versus-host disease treated with extracorporeal photopheresis”, Haematologica. Pavia, Italy, 90(4), pp. 565-567. doi: 10.3324/%x.