1 UCL Institute of Healthcare Engineering and UCL Interaction Centre, University College London, London WC1E 6BT, UK. Electronic address: a.blandford@ucl.ac.uk.
2 School of Computer Science, Mathematics, Physics and Statistics, Nelson Mandela University, Port Elizabeth, South Africa.
3 Haute Autorité de Santé, Saint Denis, France; Fondation pour une culture de sécurité industrielle, Toulouse, France.
4 Information Services and Informatics Division, Ministry of National Guard-Health Affairs, King Abdulaziz Medical City, Riyadh, Saudi Arabia.
5 King Saud Bin Abdulaziz University for Health Sciences, King Abdullah King Saud Bin AbdulAziz University for Health Sciences, National Guard Health Affairs, King AbdulAziz Medical City, Jeddah, Saudi Arabia.