1. A good chimney requires a good sweep
Viktor Hraska, MD, PhD, Ronald K. Woods, MD, PhD 
The Journal of Thoracic and Cardiovascular Surgery 
Volume 154, Issue 3, (September 2017)
DOI: /j.jtcvs
Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

2. Ronald K. Woods, MD, PhD (left), and Viktor Hraska, MD, PhD (right)
The Journal of Thoracic and Cardiovascular Surgery  , DOI: ( /j.jtcvs )
Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions