Published on in Vol 9 , No 8 (2020) :August

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 , Harvard University , Cambridge , MA , US
4 Institute of Health Informatics , University College London , London , GB
5 Health Data Research UK , London , GB