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"You would never have that for other specialities like cardiology or renal so why should it happen for palliative care?"

Blood tests also showed he had "initial, mild, renal insufficiency" - a kidney problem - that is "currently under control", the statement said.

It is not the first time that the renal team at Belfast City Hospital has made headlines.

When the synthetic compound was force-fed to rats at doses of 1 gram per kilogram of body weight for two years, the animals developed kidney cancer and other forms of renal disease.

She let him in and cared for him the last four and a half years of his life as he died of renal disease.