Validation of machine learning models for estimation of left ventricular ejection fraction on point-of-care ultrasound: insights on features that impact performance Bằng Christina L. Luong, Mohammad H. Jafari, Delaram Behnami, Yaksh R. Shah, Lynn Straatman, Nathan Van Woudenberg, Leah Christoff, Nancy Gwadry, Nathaniel M. Hawkins, Eric C. Sayre, Darwin Yeung, Michael Tsang, Ken Gin, John Jue, Parvathy Nair, Purang Abolmaesumi, Teresa Tsang

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