1 UK Dementia Research Institute Care Research & Technology Centre, based at Imperial College London and the University of Surrey; Department of Brain Sciences, Imperial College London, London W12 0NN.
2 Department of Primary Care and Public Health, Imperial College London SW7 2AZ.
3 Park Medical Centre, Hammersmith, London W6 0QG.
4 North West London Pathology, Charing Cross Hospital, London W6 8RF.
5 Department of Public Health, Hammersmith & Fulham Council, London W6 9JU.
6 Immunisation and Countermeasures Division, Public Health England, 61 Colindale Avenue, London NW9 5EQ.
7 UK Dementia Research Institute Care Research & Technology Centre, based at Imperial College London and the University of Surrey; Department of Brain Sciences, Imperial College London, London W12 0NN. Electronic address: david.sharp@imperial.ac.uk.
8 Department of Infection, Imperial College Healthcare NHS Trust, Charing Cross Hospital, London W6 8RF.