PMC:7274950 / 5558-5679 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7274950","sourcedb":"PMC","sourceid":"7274950","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7274950","text":"ratio consistent with obstructive ventilatory impairment; four of the nine were nonsmokers. Forced expiratory time to del","tracks":[]}