1. Department of Surgery UHS F. Edward Hébert School of Medicine, Bethesda, Maryland
2. Now with Department of Surgery, Beth Israel Deaconess Medical Center, Boston, Massachusetts
3. Thoracic Surgery Branch, National Cancer Institute, Bethesda, Maryland
4. Biostatistics and Data Management Section, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
5. Diabetes, Endocrine and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland