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Jamali, Amir A; Mladenov, Kiril; Meyer, Dominik C; Martinez, Alberto; Beck, Martin; Ganz, Reinhold; Leunig, Michael (2007). Anteroposterior pelvic radiographs to assess acetabular retroversion: high validity of the "cross-over-sign". Journal of orthopaedic research, 25(6), pp. 758-65. Hoboken, N.J.: Wiley 10.1002/jor.20380
