1. 1. Nakatani H. The advance and features of intractable diseases control as the health policy of the Japanese Ministry of Health and Welfare. In: Ohno Y, Tanaka H, Nakatani H, Kurokawa K, Saito H, eds. The latest information about intractable diseases, including epidemiology, clinical medicine and care for patients. Nanzando, Tokyo, 2000: 3-27. (in Japanese)
2. 2. Ueyama K, Harada M. Ossification of the posterior longitudinal ligament (OPLL). In: Ohno Y, Tanaka H, Nakatani H, Kurokawa K, Saito H, eds. The latest information about intractable diseases, including epidemiology, clinical medicine and care for the patients. Nanzando, Tokyo, 2000: 366-70. (in Japanese)
3. 3. Kawai S. Clinical manifestation of cervical ossification of the posterior longitudinal ligament. In: Yonenobu K, Sakou T, Ono K, eds. OPLL, ossification of the posterior longitudinal ligament. Springer-Verlag, Tokyo, 1997: 81-84.
4. 4. Matsunaga S, Sakou T. Epidemiology of ossification of the posterior longitudinal ligament. In: Yonenobu K, Sakou T, Ono K, eds. OPLL, ossification of the posterior longitudinal ligament. Springer-Verlag, Tokyo, 1997: 11-7.
5. Diffuse Idiopathic Skeletal Hyperostosis (DISH): Forestier's Disease with Extraspinal Manifestations