David Francis1
, Ian Roberts2
, Diana R Elbourne3
, Haleema Shakur2
, Rosemary C Knight3
, Jo Garcia3
, Claire Snowdon3,4
, Vikki A Entwistle5
, Alison M McDonald5
, Adrian M Grant5
and Marion K Campbell5 
1
Centre for Research and Innovation Management, Brighton, UK
2
Nutrition and Public Health Interventions Research Unit, London School of Hygiene and Tropical Medicine, Keppel Street, London, UK
3
Medical Statistics Unit, London School of Hygiene and Tropical Medicine, Keppel Street, London, UK
4
Centre for Family Research, University of Cambridge, Free School Lane, Cambridge, CB2 3RF, UK
5
Health Services Research Unit, University of Aberdeen, Health Sciences Building, Foresterhill, Aberdeen, UK