Where is the Evidence that Watchful Waiting should be the Preferred Strategy for Aortic Stenosis?

Within the prior 24 months, I have had a financial relationship with a company producing, marketing, selling, re-selling, or distributing healthcare products used by or on patients:

• Grant Support/Research Contract - Abbott; Boston Scientific Corporation; Cytokinetics; Edwards Lifesciences
• Consultant Fee/Honoraria/Speaker's Bureau - Medtronic; Boehringer Ingelheim; Veralox Therapeutics; AstraZenca; Premiere; Abbott; Edwards Lifesciences