Revisiting the systemic vasculitis in eosinophilic granulomatosis with polyangiitis (Churg-Strauss). A study of 157 patients by the Groupe d'Etudes et de Recherche sur les Maladies Orphelines Pulmonaires and the European Respiratory Society Taskforce on eosinophilic granulomatosis with polyangiitis (Churg-Strauss)