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- [1] Validation of Conventional and Simplified Methods to Calculate Projected Valve Area at Normal Flow Rate in Patients With Low Flow, Low Gradient Aortic Stenosis: The Multicenter TOPAS (True or Pseudo Severe Aortic Stenosis) Study JOURNAL OF THE AMERICAN SOCIETY OF ECHOCARDIOGRAPHY, 2010, 23 (04) : 380 - 386