Evaluation of capture ELISA for detection of antineutrophil cytoplasmic antibodies directed against proteinase 3 in Wegener's granulomatosis: first results from a multicentre study Csernok E  Holle J  Hellmich B  Willem J  Tervaert C  Kallenberg CGM  Limburg PC  Niles J  Pan G  Specks U  Westman K  Wieslander J  De Groot K  Gross WL