6Macchi C,Catini C,Catini CR,et al.A comparison between the heart of young athletes and of young healthy sedentary subjects:a morphometric and morpho-functional study by echocolor-doppler method.Ital J Anat Embryol,2001,106(3):221-231.
7Jobic Y,Slama M,Tribouilloy C,et al.Doppler echocardiographic evaluation of valve regurgitation in volunteers.Br Heart J,1992,69:109.
8Brand A,Dellberg S,Keren A.The prevalence of valvular regurgitation in children with structurally normal heart:A color Doppler echocardiographic study.Am Heart J,1992,123:177-180.
