1. Form ever follows function
Kenton J. Zehr, MD 
The Journal of Thoracic and Cardiovascular Surgery 
Volume 151, Issue 1, Pages (January 2016)
DOI: /j.jtcvs
Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions

2. Figure 1
A, Ceradini's device to stimulate heart valve function. B, Pulmonary valve in equilibrium.
The Journal of Thoracic and Cardiovascular Surgery  , DOI: ( /j.jtcvs )
Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions

3. Kenton J. Zehr, MD
The Journal of Thoracic and Cardiovascular Surgery  , DOI: ( /j.jtcvs )
Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions