Fragility Fracture Network-Japan: The challenge of establishment of a national hip fracture database and successful achievement of nationwide health system change for hip fracture care in Japan

Noriaki Yamamoto, Takeshi Sawaguchi, Takashi Matsushita, Narutaka Katoh, Hidenori Arai, Masahiro Shirahama, Naoto Endo, Hiroshi Hagino, Satoshi Mori, Tamio Teramoto, Masashi Ookuro, M. Hiraoka, Hideaki E. Takahashi