1. Division of General Thoracic Surgery, Mayo Clinic, Rochester, MN, USA
2. Division of Biostatistics, Mayo Clinic, Rochester, MN, USA
3. Division of Thoracic Surgery, University of Toronto, Toronto, ON, Canada
4. Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
5. Division of Thoracic Surgery, Cedars Sinai Medical Center, Los Angeles, CA, USA
6. Division of Thoracic Surgery, Vanderbilt University, Memphis, TN, USA