1. MRC Epidemiology UnitUniversity of Cambridge, Institute of Metabolic ScienceAddenbrooke's HospitalCambridge UK
2. UK Clinical Research Collaboration Centre for Diet and Activity Research, MRC Epidemiology UnitUniversity of Cambridge, Institute of Metabolic ScienceAddenbrooke's HospitalCambridge UK
3. Department of Epidemiology and Public HealthUniversity College LondonLondon UK
4. Department of Public Health and Primary Care, Institute of Public HealthUniversity of Cambridge UK