"Throughout my career I have tried to do my very best for all my patients and have had only their interests and wellbeing at heart."
The hearing follows an inquest into 10 patients' deaths which found drugs to be a factor in five cases.
In April last year, a jury inquest at Portsmouth Coroner's Court decided that in the cases of patients Robert Wilson, 74, Geoffrey Packman, 66, and Elsie Devine, 88, the use of painkillers had been inappropriate for their conditions.
Arthur Cunningham, 79, and Elsie Lavender, 83, were prescribed medication appropriate for their condition, but in doses which contributed to their deaths, jurors found.
Dr Barton left the Hampshire hospital in 2000 but still practises as a GP in Gosport.
But she has been under certain conditions since July 2008.
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