Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.
Funding: This work was supported by a grant provided by the Japan Orthopaedics and Traumatology Foundation (to KI) and a Grant-in-Aid for Young Scientists from the Japanese Ministry of Education, Culuture, Sports, Science and Technology (to KI).
Competing interests: None.
Published Online First 7 November 2006