Cardiac autonomic functions are altered in patients with acute leukemia, assessed by heart rate variability - Nevruz, O; Yokusoglu, M; Uzun, M; Demirkol, S; Avcu, F; Baysan, O; Koz, C; Cetin, T; Sag, C; Ural, A U; Isik, E. (Tohoku J Exp Med, 2007)