1. Long-term survival after thoracoscopic lung volume reduction: a multiinstitutional review 
Keith S Naunheim, MD, Larry R Kaiser, MD, Joseph E Bavaria, MD, Stephen R Hazelrigg, MD, Mitchell J Magee, MD, Rodney J Landreneau, MD, Robert J Keenan, MD, Joan F Osterloh, BSN, Theresa M Boley, Cesar A Keller, MD 
The Annals of Thoracic Surgery 
Volume 68, Issue 6, Pages (December 1999)
DOI: /S (99)

2. Fig 1
Actuarial survival curves after unilateral thoracoscopic lung volume reduction (UTLVR) and bilateral thoracoscopic lung volume reduction. Error bars represent one standard error.
The Annals of Thoracic Surgery  , DOI: ( /S (99) )