Danitza Nebor, Andre Bowers, Marie-Dominique Hardy-Dessources, Jennifer Knight-Madden, Marc Romana, Harvey Reid, Jean-Claude Barthélémy, Vanessa Cumming, Olivier Hue, Jacques Elion, Marvin Reid, Philippe Connes, CAREST study group. Frequency of pain crises in sickle cell anemia and its relationship with the sympatho-vagal balance, blood viscosity and inflammation. Haematologica 2011;96(11):1589-1594; https://doi.org/10.3324/haematol.2011.047365.