title: Invited commentary.
authors.affiliation: The University of Michigan, L3119 Women's-0273, Ann Arbor, MI 48109, USA. dbach@umich.edu
authors.forename: David S
authors.initials: DS
authors.lastname: Bach
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D001021:Aortic Valve; D001291:Attitude of Health Personnel; D006350:Heart Valve Prosthesis; D006801:Humans; D013997:Time Factors