Teuffel O, Stanulla M, Cario G, Ludwig WD, Rottgers S, Schafer BW, Zimmermann M, Schrappe M, Niggli FK. Anemia and survival in childhood acute lymphoblastic leukemia. Haematologica 2008; 93(11):1652-1657; https://doi.org/10.3324/haematol.13156.