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Meyer, Dominik C; Beck, Martin; Ellis, Tom; Ganz, Reinhold; Leunig, Michael (2006). Comparison of six radiographic projections to assess femoral head/neck asphericity. Clinical orthopaedics and related research, 445, pp. 181-185. Heidelberg: Springer 10.1097/01.blo.0000201168.72388.24