[1] UMC Nijmegen, Nijmegen, Netherlands
[2] Rheumaklin, Ratingen, Germany
[3] Univ Berlin, Klinikum Charite, Berlin, Germany
[4] Abbott GmbH & Co KG, Ludwigshafen, Germany
[5] Abbott Labs, Parsippany, NJ USA
[6] Abbott GmbH & Co KG, Ludwigshafen, Germany