1. Department of Medicine, Faculty of Medicine, Memorial University, St. John’s, Newfoundland and Labrador, Canada
2. Canadian Centre for Health and Safety in Agriculture (CCHSA), University of Saskatchewan, Saskatoon, Saskatchewan, Canada
3. Department of Medicine, University of Colorado, Denver, CO, USA
4. Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
5. School of Public Health, University of Alberta, Edmonton, Alberta, Canada