H. Roos, M. Ornell, P. Gärdsell, L. Lohmander, and A. Lindstrand, “Soccer after anterior cruciate ligament injury— an incompatible combination? A national survey of incidence and risk factors and a 7-year follow-up of 310 players”, ActaO, vol. 66, no. 2, pp. 107–112, Jan. 1995.