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Jawad, M.U., Haleem, A.A. & Scully, S.P. In Brief: Ficat Classification: Avascular Necrosis of the Femoral Head. Clin Orthop Relat Res 470, 2636–2639 (2012). https://doi.org/10.1007/s11999-012-2416-2
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DOI: https://doi.org/10.1007/s11999-012-2416-2