1. Department of Neonatology, Tuebingen University Hospital, Tuebingen, Germany
2. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada
3. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada3Division of Neonatology, Children’s Hospital of Philadelphia, University of Pennsylvania, Philadelphia
4. Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada
5. Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada
6. Department of Neonatology, Bnai Zion Medical Center, Haifa, Israel
7. Centre Hospitalier Universitaire de Quebec, Quebec City, Quebec, Canada
8. Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Canada
9. Royal Alexandra Hospital, Edmonton, Alberta, Canada
10. Department of Pediatrics, University of Calgary, Calgary, Alberta, Canada
11. Department of Pediatrics, University of British Columbia, Vancouver, Canada