Elena Neumann*, Birgit Riepl, Anette Knedla, Stephanie Lefèvre, Ingo H Tarner, Joachim Grifka, Jurgen Steinmeyer, Jurgen Schölmerich, Steffen Gay and Ulf Müller-Ladner
* Corresponding author: Elena Neumann e.neumann@kerckhoff-klinik.de
Arthritis Research & Therapy 2010, 12:R83 doi:10.1186/ar3010