1. Division of Endocrinology and Metabolism, Department of Medicine, University of British Columbia, Vancouver, BC, Canada V5Z 1M9
2. Division of Otolaryngology, Department of Surgery, University of British Columbia, Vancouver, BC, Canada V5Z 1M9
3. Department of Family Medicine, University of Saskatchwan, Regina, SK, Canada S4P 0W5
4. Alberta Children's Hospital, University of Calgary, 2888 Shaganappi Trail NW, Calgary, AB, Canada T3B 6A8