Severe Manifestation of Granulomatosis with Polyangiitis in an Adolescent with Respiratory, Hemorrhagic and Vascular Occlusive Complications - Bjelde, Antje; Leitz, Dominik; Goetzke, Carl Christoph; von Stuckrad, Anne Lim; Thumfart, Julia; Kallinich, Tilmann (Klinische Pädiatrie, 2025)