THE SIGNIFICANCE OF POLYMORPHISMS OF GENE COAGULATION FACTORS VII AND XIII IN THE PATHOGENESIS OF NON-TRAUMATIC AVASCULAR NECROSIS OF THE FEMORAL HEAD Article Panin M.A., Zagorodnii N.V., Boiko A.V., Samokhodskaya L.M., Abakirov M.D., Volkov E.E. Genij Ortopedii. Russian Ilizarov Scientific Center for Restorative Traumatology and Orthopaedics. Vol. 27. 2021. P. 43-47