[1
]
MRC Epidemiology Unit, Institute of Metabolic Science, University of Cambridge, Box
285, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom.
[2
]
Behavioural Science Group, Institute of Public Health, University of Cambridge, Forvie
Site, Robinson Way, Cambridge CB2 0SR, United Kingdom.
[3
]
MRC Epidemiology Unit, Institute of Metabolic Science, University of Cambridge, Box
285, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom. Electronic
address: simon.griffin@mrc-epid.cam.ac.uk.