Department of Epidemiology, Harvard TH Chan School of Public Health, Boston, MA, USA. Program in Genetic Epidemiology and Statistical Genetics, Harvard TH Chan School of Public Health, Boston, MA, USA. Genetic Epidemiology Group, Department of Health Sciences, University of Leicester, Leicester, UK. National Institute for Health Research, Leicester Respiratory Biomedical Research Unit, Glenfield Hospital, Leicester, UK. Behavioral and Urban Health Program, Behavioral Health and Criminal Justice Research Division, Research Triangle Institute (RTI) International, Research Triangle Park, NC, USA. Division of Infectious Diseases, Brigham and Women Hospital, Harvard Medical School, Boston, MA, USA. Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA. Department of Pulmonary Physiology and Sleep Medicine, Sir Charles Gairdner Hospital, Nedlands, Australia. School of Medicine and Pharmacology, University of Western Australia, Crawley, Australia. Icelandic Heart Association, Kopavogur, Iceland. Faculty of Medicine, University of Iceland, Reykjavik, Iceland. Center for Public Health Genomics, University of Virginia, Charlottesville, VA, USA. Department of Public Health Sciences, Division of Biostatistics and Epidemiology, University of Virginia, Charlottesville, VA, USA. Centre for Genomic & Experimental Medicine, Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, UK. Generation Scotland, Centre for Genomic and Experimental Medicine, University of Edinburgh, Edinburgh, UK. Department of Human Genetics, Wellcome Trust Sanger Institute, Hinxton, UK. MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK. Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands. Population Health Research Institute, St George's University of London, London, UK. The National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, MA, USA. The Pulmonary Center, Department of Medicine, Boston University School of Medicine, Boston, MA, USA. Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium. Department of Respiratory Medicine, Erasmus Medical Center, Rotterdam, The Netherlands. University of Groningen, University Medical Center Groningen, Department of Epidemiology, Groningen, The Netherlands. University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD, Groningen, The Netherlands. Institute of Epidemiology I, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany. Comprehensive Pneumology Center Munich (CPC-M), Member of the German Center for Lung Research, Munich, Germany. Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, UK. Department of Psychology, University of Edinburgh, Edinburgh, UK. Division of Respiratory Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK. Centre for Global Health Research, Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK. Department of Public Health, University of Helsinki, Helsinki, Finland. Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland. National Institute for Health and Welfare, Department of Health, Helsinki, Finland. MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge, UK. Institute of Metabolic Science, Biomedical Campus, Cambridge, UK. Department of Clinical Chemistry, Fimlab Laboratories, Tampere, Finland. Department of Clinical Chemistry, University of Tampere School of Medicine, Tampere, Finland. Department of Epidemiology and Biostatistics, MRC-PHE Centre for Environment & Health, School of Public Health, Imperial College London, UK. Center for Life Course Epidemiology, Faculty of Medicine, University of Oulu, Oulu, Finland. Biocenter Oulu, University of Oulu, Oulu, Finland. Unit of Primary Care, Oulu University Hospital, Oulu, Finland. Department of Clinical Physiology, University of Tampere and Tampere University Hospital, Tampere, Finland. Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, TX, USA. Faculty of Medicine, University of Split, Split, Croatia. Division of Nutritional Sciences, Cornell University, Ithaca, NY, USA. Department of Healthcare Policy and Research, Weill Cornell Medical College, NY, NY, USA. Departments of Medicine and Epidemiology, Columbia University Medical Center. Institute of Genetic Epidemiology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany. Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany. Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany. Computational Medicine Core at Center for Lung Biology, Division of Pulmonary & Critical Care Medicine, University of Washington, Seattle, WA. Cardiovascular Health Research Unit and Department of Epidemiology, University of Washington, Seattle, WA, USA. Department of Immunology, Genetics and Pathology, Uppsala Universitet, Science for Life Laboratory, Uppsala, Sweden. Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT, USA. Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA. Division of Gastroenterology, Massachusetts General Hospital, Boston, MA, USA. Human Services, Research Triangle Park, NC, USA. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, US Department of Health and Human Services, Research Triangle Park, NC, USA.