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Later that month, the Vatican warned the pontiff was in a "critical" condition after developing both respiratory and kidney problems.

The Cardinal, who is head of the Vatican's doctrinal office, dismissed speculation that the pontiff would follow his predecessor Benedict XVI and resign the papacy.

The Argentine pontiff has been recovering in hospital from pneumonia, after he was admitted on 14 February.

Catholics around the world are marking the 12th anniversary of Pope Francis's election as pontiff by praying for his recovery.

The Argentine pontiff has not been seen in public since entering the hospital, his longest stretch away from the public eye since his papacy began 12 years ago.