title: Invited commentary.
authors.affiliation: Pediatric Cardiology, Penn State Hershey Children's Hospital, The Milton S. Hershey Medical Center, Box 850, 500 University Dr, Hershey, PA 17033-0850, USA. lwolfe1@hmc.psu.edu
authors.forename: L Timothy
authors.initials: LT
authors.lastname: Wolfe
authors.forename: John L
authors.initials: JL
authors.lastname: Myers
mesh_terms: D006348:Cardiac Surgical Procedures; D017548:Echocardiography, Transesophageal / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D007223:Infant; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D008904:Miniaturization; D011446:Prospective Studies