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Kakaty, DK; Fischer, AF; Hosalkar, HS; Siebenrock, KA; Tannast, M (2010). The ischial spine sign: does pelvic tilt and rotation matter? Clinical orthopaedics and related research, 468(3), pp. 769-74. Heidelberg: Springer-Verlag 10.1007/s11999-009-1021-5
