1. Clinical Epidemiology Program, Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL A1B 3V6, Canada
2. Division of Community Health and Humanities, Faculty of Medicine, Memorial University, St. John’s, NL A1B 3V6, Canada
3. Division of Community Health and Humanities, Memorial University of Newfoundland, St. John’s, NL A1B 3V6, Canada
4. Division of Biomedical Sciences, Memorial University of Newfoundland, St. John’s, NL A1B 3V6, Canada
5. Discipline of Obstetrics and Gynecology, Faculty of Medicine, Memorial University, St. John’s, NL A1B 3V6, Canada