Ikeuchi K, Hasegawa Y, Seki T, Takegami Y, Amano T, Ishiguro N (March 2015). "Epidemiology of nontraumatic osteonecrosis of the femoral head in Japan". Modern Rheumatology. 25 (2): 278–281. doi:10.3109/14397595.2014.932038. PMID25036228. S2CID689591.
Ikeuchi K, Hasegawa Y, Seki T, Takegami Y, Amano T, Ishiguro N (March 2015). "Epidemiology of nontraumatic osteonecrosis of the femoral head in Japan". Modern Rheumatology. 25 (2): 278–281. doi:10.3109/14397595.2014.932038. PMID25036228. S2CID689591.
Ikeuchi K, Hasegawa Y, Seki T, Takegami Y, Amano T, Ishiguro N (March 2015). "Epidemiology of nontraumatic osteonecrosis of the femoral head in Japan". Modern Rheumatology. 25 (2): 278–281. doi:10.3109/14397595.2014.932038. PMID25036228. S2CID689591.