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Reference equation for spirometry interpretation for Easter..:

Angira Dasgupta ; Aloke Gopal Ghoshal ; Ansuman Mukhopadhyay...
http://www.lungindia.com/article.asp?issn=0970-2113;year=2015;volume=32;issue=1;spage=34;epage=39;aulast=Dasgupta.  , 2015