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Pulmonary function testing during the COVID-19 pandemicin:

Devasahayam Jesudas Christopher ; B V Murali Mohan ; Rupak Singla.
http://www.lungindia.com/article.asp?issn=0970-2113;year=2021;volume=38;issue=7;spage=92;epage=96;aulast=Christopher.  , 2021