What is the impact of center variability in a multicenter international prospective observational study on developmental dysplasia of the hip?

Mulpuri K, Schaeffer EK, Kelley SP, Castaneda P, Clarke NM, Herrera-Soto JA, Upasani V, Narayanan UG, Price CT, IHDI Study Group. What is the impact of center variability in a multicenter international prospective observational study on developmental dysplasia of the hip? Clin Orthop Relat Res. May 2016. DOIi: 10.1007/s11999-016-4746-y.