1. Embryology, anatomy, and normal findings;Kan,2013
2. Radiographic standards for postnatal ossification and tooth calcification;Garn;Med Radiogr Photogr,1967
3. Radiographic features of neonatal congenital dislocation of the hip;Bertol;J Bone Joint Surg Br,1982
4. Present status of maternal and child health – Ministry of health, labour and welfare, (in Japanese). http://www.mhlw.go.jp/stf/shingi/2r9852000001oujo-att/2r9852000001oumv.pdf, Accessed October 12 2017.
5. Radiological results of treatment using an extensive anterolateral approach for developmental dysplasia of the hip: minimum 5-year follow-up;Sugawara;J Pediatr Orthop B,2016