1. University of Cambridge; Behaviour and Health Research Unit; Forvie Site Robinson Way Cambridge UK CB2 0SR
2. University College London; EPPI-Centre; 10 Woburn Square London UK WC1H 0NR
3. University of Oxford; Nuffield Department of Primary Care Health Sciences; Radcliffe Observatory Quarter Woodstock Road Oxford Oxfordshire UK OX2 6GG
4. MRC Human Nutrition Research; Elsie Widdowson Laboratory, 120 Fulbourn Road Cambridge UK CB1 9NL
5. University of Plymouth; Centre for Mathematical Sciences, School of Computing, Electronics and Mathematics; Plymouth UK
6. University of Bristol; Population Health Sciences, Bristol Medical School; Canynge Hall 39 Whatley Road Bristol UK BS8 2PS
7. University of Cambridge; MRC Epidemiology Unit; Box 285 Cambridge Biomedical Campus Cambridge UK CB2 0QQ