Reference number is inaccurate and should be replaced by the following two references: L. A. Styles, M. Abboud, S. Larkin, M. Lo, and F. A. Kuypers, “Transfusion prevents acute chest syndrome predicted by elevated secretory phospholipase A2,” British Journal of Haematology, vol. 136, no. 2, pp. 343–344, 2007. T. Scott Miller, E. Wright, M. Abboud et al., “Impact of chronic transfusion on incidence of pain and acute chest syndrome during the Stroke Prevention Trial (STOP) in sickle-cell anemia,” Journal of Pediatrics, vol. 139, no. 6, pp. 785–789, 2001.