Hinderaker, Thore, Anne K Daltveit, Lorentz M Irgens, Alf Udén, and Olav Reikeräs. 1994. “The Impact of Intra-Uterine Factors on Neonatal Hip Instability”. Acta Orthopaedica 65 (3):239-42. https://doi.org/10.3109/17453679408995446.