Warren, F. C., Abel, G., Lyratzopoulos, G., Elliott, M. N., Richards, S., Barry, H. E., . . . Campbell, J. L. (2015). Characteristics of service users and provider organisations associated with experience of out of hours general practitioner care in England: Population based cross sectional postal questionnaire survey. BMJ.

Warren, Fiona C., Gary Abel, Georgios Lyratzopoulos, Marc N. Elliott, Suzanne Richards, Heather E. Barry, Martin Roland, and John L. Campbell. "Characteristics of Service Users and Provider Organisations Associated With Experience of Out of Hours General Practitioner Care in England: Population Based Cross Sectional Postal Questionnaire Survey." BMJ 2015.

Warren, Fiona C., et al. "Characteristics of Service Users and Provider Organisations Associated With Experience of Out of Hours General Practitioner Care in England: Population Based Cross Sectional Postal Questionnaire Survey." BMJ 2015.