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Parkins, D. J., Benwell, M. J., Edgar, D. F 
ORCID: 0000-0001-9004-264X and Evans, B. J. W. (2018).
The relationship between unwarranted variation in optometric referrals and time since qualification.
Ophthalmic And Physiological Optics, 38(5),
pp. 550-561.
doi: 10.1111/opo.12580
Benwell, M. J. (1998). Medical and professional homoeopathy in the UK: a study of tensions in a heterodox healthcare profession. (Unpublished Doctoral thesis, City University London)