％0期刊文章％a aggarwal，deepak％saini，varinder％t因子限制了诊断出支气管肺泡灌洗的效用，诊断为covid-19％D 2020％r 10.1183/13993003.03003.03116-20216-2020％56％n 5％u //www.qdcxjkg.com/content/erj/56/5/5/5/2003116.full.pdf