C. Turriago, A. Medina, I. C. Uribe, V. A. Vargas, and M. Ardila, “Diagnostic opportunity for developing hip dysplasia: Difference between the contributory social security health system and the prepaid and private medical systems in Bogotá”., Rev. Colomb. Ortop. Traumatol., vol. 26, no. 3, pp. 153–157, Sep. 2012.