Smyth L, Gaskin G, Pusey C D. Microscopic polyangiitis[J]. Semin Respir Crit Care Med, 2004, 25(5): 523-533.? [2]Collins C E, Quismorio F P Jr. Pulmonary involvement in microscopic polyangiitis[J]. Curr Opin Pulm Med, 2005, 11(5): 447-451.? [3]Kallenberg C G. The diagnosis and classification of microscopic polyangiitis[J]. J Autoimmun, 2014, 48-49: 90-93. ?