1. Latner Thoracic Surgery Research Laboratories; Toronto General Research Institute; University Health Network, University of Toronto; Toronto Ontario Canada
2. Department of Thoracic and Cardiovascular Surgery; Kansai Medical University; Hirakara Japan
3. Department of Epidemiology and Biostatistics; School of Medicine; University of Tsukuba; Tsukuba Japan
4. Division of Respirology; University of Toronto; Toronto Ontario Canada
5. Department of Thoracic Surgery; Kyoto University; Kyoto Japan