1 Department of Behavioural Science and Health, Institute of Epidemiology and Health Care, University College London, London WC1E 7HB, UK. Electronic address: mikaela.bloomberg.19@ucl.ac.uk.
2 Department of Behavioural Science and Health, Institute of Epidemiology and Health Care, University College London, London WC1E 7HB, UK.
3 Division of Surgery and Interventional Science, University College London, London, UK.