Published on in Vol 22 , No 12 (2020) :December

1 Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, GB
2 Research Department of Behavioural Science and Health, University College London, London, GB
3 Department of Statistics, University of California Irvine, Irvine, CA, US
4 Health Data Research UK, London, GB
5 Institute of Health Informatics, University College London, London, GB