Stefan Doebele*, Sebastian Siebenlist, Helen Vester, Petra Wolf, Ulrich Hagn, Ulrich Schreiber, Ulrich Stöckle and Martin Lucke
* Corresponding author: Stefan Doebele doebele@tum.de
BMC Musculoskeletal Disorders 2012, 13:33 doi:10.1186/1471-2474-13-33
Fields marked * are required