1. Lady Davis Institute for Medical Research, Jewish General Hospital, Montréal, Québec, Canada
2. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montréal, Québec, Canada
3. Department of Psychiatry, McGill University, Montréal, Québec, Canada
4. Center for Internal Medicine and Dermatology, Department of Psychosomatic Medicine, Charité, Universitätsmedizin Berlin, Germany
5. Department of Medicine, McGill University, Montréal, Québec, Canada
6. Respiratory Epidemiology and Clinical Research Unit, McGill University Health Centre, Montréal, Québec, Canada
7. Department of Psychology, McGill University, Montréal, Québec, Canada