Retraction to: J Bone Miner Metab (2010) 28:202–208 https://doi.org/10.1007/s00774-009-0116-0

The Editors-in-Chief have retracted this article [1] because approval from the Keiyu Orthopedic Hospital ethics committee was not obtained before the study commenced.

Jun Iwamoto and Hideo Matsumoto have not responded to correspondence from the Editors-in-Chief or the Publisher about this retraction. The Editors-in-Chief have not been able to obtain current email addresses for Tsuyoshi Takeda and Mitsuyoshi Uzawa. Yoshihiro Sato is deceased.