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Siebenrock, K A; Ferner, F; Noble, P C; Santore, R F; Werlen, S; Mamisch, T C (2011). The cam-type deformity of the proximal femur arises in childhood in response to vigorous sporting activity. Clinical orthopaedics and related research, 469(11), pp. 3229-40. Heidelberg: Springer-Verlag 10.1007/s11999-011-1945-4
