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Prevalence of chronic obstructive pulmonary disease and its..:

B G Parasuramalu ; N Huliraj ; S P Prashanth Kumar...
http://www.ijph.in/article.asp?issn=0019-557X;year=2014;volume=58;issue=1;spage=45;epage=49;aulast=Parasuramalu.  , 2014