MPO and celiac disease: ANA: antinuclear antibody; ANCA: antineutrophil cytoplasmic antibody; APLA: antiphospholipid antibody; AZA: azathioprine; cANCA: cytoplasmic ANCA; CD: celiac disease; CS: corticosteroid; CT: computed tomography; CYC: cyclophosphamide; GBM: glomerular basement membrane; HCQ: hydroxychloroquine; HLM: hemosiderin-laden macrophages; IPH: idiopathic pulmonary hemosiderosis; MMF: mycophenolate; MPO: myeloperoxidase; MTX: methotrexate; NS: not specified; pANCA: perinuclear ANCA; PR3: proteinase 3; PFT: pulmonary function test; TTG: tissue transglutaminase