About the Authors

Amrit Singh

Affiliations James Hogg Research Centre, St. Paul’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada, Institute for HEART+LUNG Health, Vancouver, British Columbia, Canada, NCE CECR PROOF Centre of Excellence, Vancouver, British Columbia, Canada

Masatsugu Yamamoto

Affiliations James Hogg Research Centre, St. Paul’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada, Institute for HEART+LUNG Health, Vancouver, British Columbia, Canada, Division of Respiratory Medicine, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada

Sarah H. Y. Kam

Affiliations James Hogg Research Centre, St. Paul’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada, Institute for HEART+LUNG Health, Vancouver, British Columbia, Canada

Jian Ruan

Affiliations James Hogg Research Centre, St. Paul’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada, Institute for HEART+LUNG Health, Vancouver, British Columbia, Canada

Gail M. Gauvreau

Affiliation Department of Medicine, McMaster University, Hamilton, Ontario, Canada

Paul M. O'Byrne

Affiliation Department of Medicine, McMaster University, Hamilton, Ontario, Canada

J. Mark FitzGerald

Affiliations Institute for HEART+LUNG Health, Vancouver, British Columbia, Canada, Division of Respiratory Medicine, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada, Vancouver Coastal Health Research Institute, Vancouver General Hospital, Vancouver, British Columbia, Canada

Robert Schellenberg

Affiliations James Hogg Research Centre, St. Paul’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada, Division of Respiratory Medicine, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada

Louis-Philippe Boulet

Affiliation Centre de Pneumologie de L’Hopital, Université Laval, Sainte-Foy, Quebec, Canada

Gabriella Wojewodka

Affiliation Department of Human Genetics, McGill University, Montreal, Quebec, Canada

Cynthia Kanagaratham

Affiliation Department of Human Genetics, McGill University, Montreal, Quebec, Canada

Juan B. De Sanctis

Affiliations Department of Human Genetics, McGill University, Montreal, Quebec, Canada, Central University of Venezuela, Institute of Immunology, Caracas, Venezuela

Danuta Radzioch

Affiliation Department of Human Genetics, McGill University, Montreal, Quebec, Canada

Scott J. Tebbutt

Scott.Tebbutt@hli.ubc.ca

Affiliations James Hogg Research Centre, St. Paul’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada, Institute for HEART+LUNG Health, Vancouver, British Columbia, Canada, NCE CECR PROOF Centre of Excellence, Vancouver, British Columbia, Canada, Division of Respiratory Medicine, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada

Competing Interests

The authors have the following interests. This study was funded by AllerGen NCE Inc. Metabolon Incorporated (Durham, North Carolina, United States) performed the metabolite profiling and data processing for this study. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: GMG PMO JMF L-PB DR SJT. Analyzed the data: AS SHYK GMG GW CK DR SJT. Wrote the paper: AS MY SHYK JR GMG PMO JMF RS L-PB GW CK JBD DR SJT.