Hirahara, Kazuhisa, et al. “Osteonecrosis of the Femoral Head in a Patient With Henoch-Schönlein Purpura and Drug-Induced Hypersensitivity Syndrome Treated With Corticosteroids”. Acta Dermato-Venereologica, vol. 93, no. 1, July 2012, pp. 85-86, doi:10.2340/00015555-1417.