Geertsema, D., Meinardi, J. E., Kempink, D. R. J., Fiocco, M., van de Sande, M. A. J. Screening program for neonates at risk for developmental dysplasia of the hip: comparing first radiographic evaluation at five months with the standard twelve week ultrasound. A prospective cross-sectional cohort study. Int Orthop 2019; 8: 1933-1938