Estimating the treatment effect from non-randomized studies: The example of reduced intensity conditioning allogeneic stem cell transplantation in hematological diseases. - Resche-Rigon, Matthieu; Pirracchio, Romain; Robin, Marie; De Latour, Regis Peffault; Sibon, David; Ades, Lionel; Ribaud, Patricia; Fermand, Jean-Paul; Thieblemont, Catherine; Soci‚, G‚rard; Chevret, Sylvie (BMC Blood Disorders, 2012)