1 Department of Cardiothoracic and Vascular Surgery, University of Texas Health Science Center Houston, McGovern Medical School, Memorial Hermann Hospital-Heart and Vascular Institute, Houston, Tex. Electronic address: tom.c.nguyen@gmail.com.
2 Department of Cardiothoracic Surgery, Dwight D. Eisenhower Army Medical Center, Fort Gordon, Ga.
3 Department of Cardiothoracic and Vascular Surgery, University of Texas Health Science Center Houston, McGovern Medical School, Memorial Hermann Hospital-Heart and Vascular Institute, Houston, Tex.
4 Division of Cardiology, Department of Internal Medicine, University of Texas Health Science Center Houston, McGovern Medical School, Memorial Hermann Hospital-Heart and Vascular Institute, Houston, Tex.