Drennan VM, de Lusignan S, Gage H, Gabe J, Halter M. Building an evidence base for the primary care workforce BMJ 2018;360:k248 

Halter, Mary, Joly, Louise, de Lusignan, Simon, Grant, Robert, Gage, Heather and Drennan, Vari (2018) Capturing complexity in clinician case-mix: classification system development using GP and Physician Associate data. BJGP Open, ISSN (online) 2398-3795 (Epub Ahead of Print) 

Halter, Mary, Boiko, Olga, Pelone, Ferruccio, Beighton, Carole, Harris, Ruth, Gale, Julia, Gourlay, Stephen and Drennan, Vari (2017) The determinants and consequences of adult nursing staff turnover: a systematic review of systematic reviews. BMC Health Services Research, 17(824), ISSN (online) 1472-6963 

Wheeler C, Halter M, Parle J, de Lusigan S, Ennis J, Grant R, Begg P, Gage H, Gabe J, Drennan VM.(2017) Physician associates working in secondary care teams in England: interprofessional implications from a national survey. Journal of Interprofessional Care. Journal of Interprofessional Care, ISSN (print) 1356-1820 (Epub Ahead of Print) 

Halter M, Pelone F, Beighton C, Boiko O, Harris R, Gourlay S, Drennan VM. (2017) Interventions to Reduce Adult Nursing Turnover: a Systematic Review of Systematic Reviews. Open Nursing Journal, 11, pp. 108-123. ISSN (online) 1874-4346 

Halter, Mary, Wheeler, Carly, Drennan, Vari M, de Lusignan, Simon, Grant, Robert, Gabe, Jonathan, Gage, Heather, Ennis, James and Parle, Jim (2017) Physician associates in England's hospitals : a survey of medical directors exploring current usage and factors affecting recruitment. Clinical Medicine, 17(2), pp. 126-131. ISSN (print) 1470-2118 

Drennan, Vari M., Gabe, Jonathon, Halter, Mary, de Lusignan, Simon and Levenson, Ros (2017) Physician associates in primary health care in England: a challenge to professional boundaries? Social Science and Medicine, 181, pp. 9-16. ISSN (print) 0277-9536 

Snooks H, Anthony R, Chatters R, Dale J, Fothergill R, Gaze S, Halter M, Humphreys I, Koniotou M, Logan P, Lyons R, Mason S, Nicholl J, Peconi J, Phillips CJ, Porter AM, Siriwardena AN, Wani M, Watkins A, Wilson L, Russell IT. Paramedic Assessment of Older Adults Following Falls Including Community Care Referral Pathway: Cluster Randomized Trial,"" Annals of Emergency Medicine, 2017 (Epub Ahead of Print; DOI: http://dx.doi.org/10.1016/j.annemergmed.2017.01.006) 

Halter, Mary, Drennan, Vari, Joly, Louise, Gabe, Jonathan, Gage, Heather and de Lusignan, Simon The patients’ perspective of physician associates in primary care in England: a qualitative study. Health Expectations, 2017; ISSN (print) 1369-6513 

Drennan, Vari, Halter, Mary, Gale, Julia and Harris, Ruth (2016) Retaining nurses in metropolitan areas: insights from senior nurse and human resource managers. Journal Of Nursing Management, 24(8), pp. 1041-1048. ISSN (print) 0966-0429/ 

de Lusignan, Simon, McGovern, Andrew P., Tahir, Mohammad Aumran, Hassan, Simon, Jones, Simon, Halter, Mary, Joly, Louise and Drennan, Vari M. (2016) Physician associate and general practitioner consultations: a comparative observational video study. PLoS One, 11(8), e0160902. ISSN (online) 1932-6203 

Koniotou M, Evans BA, Chatters R, Fothergill R, Garnsworthy C, Gaze S, Halter M, Mason S, Peconi J, Porter A, Siriwardena AN, Toghill A, Snooks H. Involving older people in a multi-centre randomised trial of a complex intervention in pre-hospital emergency care: implementation of a collaborative model. Trials 2015;16:1745-6215 

Drennan VM, Halter M, Joly L, Gage H, Grant RL, Gabe J, Brearley S, Carneiro W, de Lusignan S. Physician associates and GPs in primary care: a comparison. British Journal of General Practice 2015;65:e344-e350. 

Drennan V, Halter M, Brearley S, Carneiro W, Gabe J, Gage H, et al. Investigating the contribution of physician assistants to primary care in England: a mixed-methods study. Health Serv Deliv Res 2014;2(16).