1. Near-infrared spectroscopy: What we know and what we need to know—A systematic review of the congenital heart disease literature 
Jennifer C. Hirsch, MD, John R. Charpie, MD, PhD, Richard G. Ohye, MD, James G. Gurney, PhD 
The Journal of Thoracic and Cardiovascular Surgery 
Volume 137, Issue 1, Pages e12 (January 2009)
DOI: /j.jtcvs
Copyright © 2009 The American Association for Thoracic Surgery Terms and Conditions

2. Figure 1
Search strategy and study selection for inclusion. ∗Exclusion criteria: adult patients, non-English, noncardiac patients, editorials, case reports, and duplicates.
The Journal of Thoracic and Cardiovascular Surgery  , e12DOI: ( /j.jtcvs )
Copyright © 2009 The American Association for Thoracic Surgery Terms and Conditions

3. Figure 2
Classification of included manuscripts based on clinical application.
The Journal of Thoracic and Cardiovascular Surgery  , e12DOI: ( /j.jtcvs )
Copyright © 2009 The American Association for Thoracic Surgery Terms and Conditions

4. Figure 3 Classification of NIRS monitoring in the operating room.
The Journal of Thoracic and Cardiovascular Surgery  , e12DOI: ( /j.jtcvs )
Copyright © 2009 The American Association for Thoracic Surgery Terms and Conditions