1. School of Pharmacy, Memorial University, St. John's, Newfoundland, Canada.
2. Clinical Epidemiology Unit, Memorial University, St. John's, Newfoundland, Canada.
3. Janeway Child Health and Rehabilitation Centre, Eastern Health, St. John's, Newfoundland, Canada.
4. Research and Evaluation Department, Centre for Health Information, St. John's, Newfoundland, Canada.
5. Division of Community Health and Humanities, Faculty of Medicine, Memorial University, St. John's, Newfoundland, Canada.