1. 25-year experience with 456 combined mitral and aortic valve replacement for rheumatic heart disease 
Stanley John, Edwin Ravikumar, Colin N John, Velayudhan V Bashi 
The Annals of Thoracic Surgery 
Volume 69, Issue 4, Pages (April 2000)
DOI: /S (99)

2. Fig 1
Actuarial survival of hospital survivors after combined mitral and aortic valve replacement. (C.I. = confidence interval.)
The Annals of Thoracic Surgery  , DOI: ( /S (99) )

3. Fig 2
Actuarial freedom from valve-related complications after mitral and aortic valve replacement. (C.I. = confidence interval.)
The Annals of Thoracic Surgery  , DOI: ( /S (99) )