Patients
Patients were aged over 15 years and had a diagnosis of GPA or MPA according to the Chapel Hill Consensus Conference 2012 definitions, and a current or prior positive test for proteinase 3 (PR3)-ANCA or myeloperoxidase (MPO)-ANCA.Patients were recruited from 29 centres in seven countries between April 2013 and November 2016. The last patient visit was in November 2019.