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3. Cyvin , K. B. 1977 Congenital dislocation of the hip joint Acta Paediatrica Scandinavica Suppl. 263
4. Congenital dislocation of the hip. The development of a regional service;Mackenzie;Journal of Bone and Joint Surgery,1972
5. Congenital hip dislocation in a Cree-Ojibwa population;Walker;Canadian Medical Association Journal,1977