1. Stentless Aortic Bioprostheses: Compelling Data From the Second International Symposium 
Stephen Westaby, Hans A Huysmans, Tirone E David 
The Annals of Thoracic Surgery 
Volume 65, Issue 1, Pages (January 1998)
DOI: /S (97)

2. Fig. 1
The Toronto SPV valve. (Reprinted courtesy of St. Jude Medical, St. Paul, MN. All rights reserved.)
The Annals of Thoracic Surgery  , DOI: ( /S (97) )

3. Fig. 2
The Freestyle valve. (Reprinted by permission of Medtronic, Minneapolis, MN.)
The Annals of Thoracic Surgery  , DOI: ( /S (97) )

4. Fig. 3
The CryoLife-O’Brien stentless valve. (Reprinted by permission of Cryolife International, Inc, Kennesaw, GA.)
The Annals of Thoracic Surgery  , DOI: ( /S (97) )