1. 1) M. Kikuchi, Y. Suetsugu, J. Tanaka, K. Imura, H. Umemoto, N. Ninowa, M. Kinoshita, A. Hojo and H. Yamazaki, “Calcium phosphate porous sintered body and production thereof”, JP3400740, US6,340,648, GB2348872A.
2. 2) Y. Suetsugu, Y. Hotta, M. Iwasashi, M. Sakane, M. Kikuchi, T. Ikoma, T. Higaki, N. Ochiai and J. Tanaka, Key Eng. Mat., 330–332, 1003–1006 (2007).
3. 3) W. Bonfiled, Ann. N. Y. Acad. Sci., 523, 173–177 (1998).
4. 4) https://medtech.pharmaintelligence.informa.com/MT087959/Smith-and-Nephew-Richards-800th-Hapex-middle-ear-implant, visited 17th April (2020).
5. 5) M. Kikuchi, Y. Koyama, T. Yamada, Y. Imamura, T. Okada, N. Shirahama, K. Akita, K. Takakuda and J. Tanaka, Biomate., 25, 5979–5986 (2004).