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To investigate an association between steroid‐induced femoral head osteonecrosis (FHON) and functional vascular endothelial growth factor (VEGF) gene (−2578A/C, −1154A/G, −634C/G, and +405C/G) polymorphisms polymerase chain reaction‐restriction fragment length polymorphism genotyping was performed in 160 patients (86 idiopathic FHON and 74 steroid‐induced FHON) and 160 gender‐ and age‐matched controls...
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