Skalska-Sadowska J, Wachowiak J, Skalska-Sadowska J, Wachowiak J, Zając-Spychała O, Niewiadomska-Wojnałowicz I, Januszkiewicz-Lewandowska D, Balwierz W, Pawińska-Wąsikowska K, Goździk J, et al. Outcome of refractory and relapsed acute myeloid leukemia in children treated during 2005-2011 - experience of the Polish Pediatric Leukemia/Lymphoma Study Group (PPLLSG). Contemp Oncol (Pozn). 2014;18(1):48-53.