Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) HADA Yoshiyuki,Principles of Quantification of Valvular Regurgitation,Choonpa Igaku,1346-1176,The Japan Society of Ultrasonics in Medicine,2006,33,6,621-630,https://cir.nii.ac.jp/crid/1390001205199710080,https://doi.org/10.3179/jjmu.33.621