4Hunninghake GW, Costabel U, Ando M, et al. ATS/ERS/ WASOG statement on sarcoidosis. American Thoracic Society/European Respiratory Society/World Association of Sarcoidosis and other Granulomatous Disorders[J]. Sarcoidosis Vase Diffuse Lung Dis, 1999,16 (2) : 149-173.