ChiCTR2000030088 言語未定義Diagnosis: COVID-19Lung DiseaseSCT types: alloStatus: not yet openTrial ID link: http://www.chictr.org.cn/showproj.aspx?proj=49902Ages: 18 to 80Trial address: The 5th medical center of PLA general hospital, Beijing, China 6 Fucheng Road, Haidian District, Beijing, China中国 , Data type: Cord Tissue