A randomized trial investigating an exercise program to prevent reduction of bone mineral density and impairment of motor performance during treatment for childhood acute lymphoblastic leukemia - Hartman, A; Te Winkel, M L; van Beek, R D; de Muinck Keizer-Schrama, S M; Kemper, H C; Hop, W C; van den Heuvel-Eibrink, M M; Pieters, R (Pediatr Blood Cancer, 2009)