1 King's Centre for Military Health Research, Institute of Psychology, Psychiatry and Neuroscience, King's College London, 10 Cutcombe Road, London SE5 9RJ, UK.
2 Health Protection Research Unit, Institute of Psychology, Psychiatry and Neuroscience, King's College London, 10 Cutcombe Road, London SE5 9RJ, UK.
3 Behavioural Science Team, Emergency Response Department Science & Technology, Public Health England, Porton Down, Salisbury SP4 0JG, UK.
4 Department of Computer Science, University College London, London WC1E 6BT, UK.
5 Department of Experimental Psychology, Anna Watts Building, University of Oxford, Oxford OX2 6GG, UK.
6 Department of Science, Technology, Engineering and Public Policy (STEaPP), University College London, London WC1E 6BT, UK.
7 Department of Anaesthesia, University College London Hospital, 235 Euston Road, London WC1E 6BT, UK.