Authors: Tim D Spector; Mario R Calomme; Simon H Anderson; Gail Clement; Liisa Bevan; Nathalie Demeester; Rami Swaminathan; Ravin Jugdaohsingh; Dirk A Vanden Berghe; Jonathan J Powell Journal: BMC Musculoskelet Disord Date: 2008-06-11 Impact factor: 2.362