1. Department of Internal Medicine, University of Texas Health Science Center at Houston, Houston, Texas
2. Department of Interventional Pulmonology, Mater Misericordiae University Hospital, Dublin, Ireland
3. Department of Pulmonary Medicine, Clinica Alemana de Santiago, Santiago, Chile
4. Department of Cytology and
5. Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas