Affiliations

• ¹ Lifecourse Epidemiology and Biostatistics Section, Population, Policy and Practice Programme, Institute of Child Health, University College London, London WC1N 1EH, UK; UCL Great Ormond Street Institute of Child Health, London, UK; Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK; NIHR Great Ormond Street Hospital Biomedical Research Centre, London, UK. Electronic address: a.solebo@ucl.ac.uk.
• ² UCL Great Ormond Street Institute of Child Health, London, UK.