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3. Optimal resource for ultrasound examination of the heart. Echocardiography study group;Popp;Circulation,1982
4. Interpretation of echocardiographic data: are physicians and sonographers violation the law?;Kisslo;J AM Soc ECHO,1988
5. Sonographer's response: are we practicing medicine without a license?;Adams;J AM Soc ECHO,1988