1. Leiden University Medical Center; Department of Rheumatology; Albinusdreef 2 Leiden Zuid-Holland Netherlands 2333 ZA
2. Leiden University Medical Center; Department of Physical Therapy; Albinusdreef 2 Leiden Netherlands 2333 ZA
3. Leiden University Medical Center; Walaeus Library; Leiden Netherlands
4. Sint Maartenskliniek; Department of Rheumatology; Hengstdal 3 Nijmegen Netherlands 6522 JV