1. Institute of Applied Health Research University of Birmingham Birmingham UK
2. Tommy's National Centre for Miscarriage Research, Institute of Metabolism and Systems Research, College of Medical and Dental Sciences University of Birmingham Edgbaston UK
3. School of Epidemiology and Public Health University of Ottawa Ottawa Ontario Canada
4. OMNI Research Group, Clinical Epidemiology Program Ottawa Hospital Research Institute Ottawa Ontario Canada
5. Clinical Epidemiology Program Ottawa Hospital Research Institute Ottawa Ontario Canada
6. School of Epidemiology, Public Health and Preventive Medicine University of Ottawa Ottawa Ontario Canada