About the Authors

Amanda Nicholson

Current address: Faculty of Health and Medicine, Lancaster University, Lancaster, United Kingdom

Affiliation Division of Primary Care and Public Health, Brighton and Sussex Medical School, Brighton, United Kingdom

Elizabeth Ford

e.m.ford@bsms.ac.uk

Affiliation Division of Primary Care and Public Health, Brighton and Sussex Medical School, Brighton, United Kingdom

Kevin A. Davies

Affiliation Division of Primary Care and Public Health, Brighton and Sussex Medical School, Brighton, United Kingdom

Helen E. Smith

Affiliation Division of Primary Care and Public Health, Brighton and Sussex Medical School, Brighton, United Kingdom

Greta Rait

Affiliation Research Department of Primary Care and Population Health, University College London, London, United Kingdom

A. Rosemary Tate

Affiliation Department of Informatics, University of Sussex, Brighton, United Kingdom

Irene Petersen

Affiliation Research Department of Primary Care and Population Health, University College London, London, United Kingdom

Jackie Cassell

Affiliation Division of Primary Care and Public Health, Brighton and Sussex Medical School, Brighton, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Gave clinical expertise for drawing up code lists: JC KD HS GR. Gave advice on analysing data: ART IP. Conceived and designed the experiments: AN KD HS GR ART IP JC. Performed the experiments: AN. Analyzed the data: AN EF. Wrote the paper: AN EF.