Appropriateness use criteria for transthoracic echocardiography: Relationship with radiology benefit managers preauthorization determination and comparison of the new (2010) criter... by Willens, Howard J., MD, Hendel, Robert C., MD, Inhaber, Francine R., MD, Chakko, Simon C., MD, Postel, Cheryl, RDCS, Hasan, Tahira, BS, Mohammed, Fareed, CT

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