Commentary: Chicken or egg?Central Message

• Edward Y. Sako, MD, PhD

Affiliations

Edward Y. Sako, MD, PhD

Address for reprints: Edward Y. Sako, MD, PhD, Department of Cardiothoracic Surgery, University of Texas Health Science Center at San Antonio, Mail Code 7841, 7703 Floyd Curl Dr, San Antonio, TX 78229-3900.; Department of Cardiothoracic Surgery, University of Texas Health Science Center at San Antonio, San Antonio, Tex