- Correspondence to Dr Oliver Rivero-Arias, National Perinatal Epidemiology Unit (NPEU), Nuffield Department of Population Health, University of Oxford, Old Road Campus, Oxford, OX3 7LF, UK;
- Received January 8, 2020
- Revised June 30, 2020
- Accepted July 7, 2020
- First published August 12, 2020.
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