Deena A Abdulahad, Johanna Westra*, Johannes Bijzet, Sebastian Dolff, Marcory C van Dijk, Pieter C Limburg, Cees GM Kallenberg and Marc Bijl
* Corresponding author: Johanna Westra Johanna.Westra@med.umcg.nl
Arthritis Research & Therapy 2012, 14:R184 doi:10.1186/ar4015