1. Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
2. Medscape Oncology, New York, NY 10014, USA
3. Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
4. Department of Thoracic Imaging, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
5. Thoracic Oncology Center, The Ohio State University Comprehensive Cancer Center, Columbus, OH 43210, USA