<k><nlm:affiliation>From the Department of Respiratory Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, #1 Shuaifuyuan Street, Dongcheng District, Beijing, China, 100730 (SL, XYS, YYZ, HH, ZJX); Radiological Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, #1 Shuaifuyuan Street, Dongcheng District, Beijing, China, 100730 (KX); and Pathological Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, #1 Shuaifuyuan Street, Dongcheng District, Beijing, China, 100730 (YLB).</nlm:affiliation>
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