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Valsalva maneuver and strain-related ECG changes:

Seyed Mehran Hosseini ; Mohsen Jamshir
http://www.rcvmonline.com/article.asp?issn=2251-9572;year=2015;volume=4;issue=4;spage=8;epage=8;aulast=Hosseini;type=0.  , 2015