1. Aortic Valve Replacement With Patch Enlargement of the Aortic Annulus
K.Eric Sommers, MD, Tirone E David, MD 
The Annals of Thoracic Surgery 
Volume 63, Issue 6, Pages (June 1997)
DOI: /S (97)

2. Fig. 1
Actuarial overall survival in patients requiring aortic annulus enlargement for aortic valve replacement compared with those not requiring enlargement.
The Annals of Thoracic Surgery  , DOI: ( /S (97) )

3. Fig. 2
Actuarial survival of case–control matched groups of patients requiring annulus enlargement and those not requiring enlargement.
The Annals of Thoracic Surgery  , DOI: ( /S (97) )