We collected the induced sputum from enrolled 1629 children <*> with no respiratory symptom prior to pediatric surgery between March 2017 and February 2019 .
( under 18 years of age )
We collected the induced sputum from enrolled 1629 children ( under 18 years of age ) with no respiratory symptom prior to pediatric surgery between March 2017 and February 2019 .
We collected the induced sputum from enrolled 1629 children ( under 18 years of age ) with no respiratory symptom prior to pediatric surgery between March 2017 and February 2019 .