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Yamaguchi, R., Yamamoto, T., Motomura, G., Ikemura, S., & Iwamoto, Y. (2011). Incidence of nontraumatic osteonecrosis of the femoral head in the Japanese population. Arthritis & Rheumatism, 63(10), 3169–3173. doi:10.1002/art.30484 
10.1002/art.30484