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. Centre for Prognosis Research School of Medicine Keele University Staffordshire UK
4. Department of Psychiatry McGill University Montréal Québec Canada
5. Department of Medicine McGill University Montréal Québec Canada
6. Department of Psychology McGill University Montréal Québec Canada
7. Respiratory Epidemiology and Clinical Research Unit McGill University Health Centre Montréal Québec Canada