M Athanassiou-Metaxa, J Kirkos, A Koussi, E Hatzipantelis, I Tsatra, M Economou. Avascular necrosis of the femoral head among children and adolescents with sickle cell disease in Greece. Haematologica 2002;87(7):771-772; https://doi.org/10.3324/%x.