QUB Prof Phil Scraton spent the night in a chair at the Ulster Hospital before being admitted.
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NI nurses strike
Mark Devenport
Political editor, Northern Ireland
The cash row has curtailed the executive's honeymoon period
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Unison and RCN step back from industrial action over pay and staffing following Stormont deal.
Read moreHealth minister Robin Swann tells the NI Assembly that pay parity for health workers can now be restored.
Robin Swann says he will meet with trades unions "as soon as possible".
Read moreThe president of the Royal College of Nursing says that health workers need to be convinced a deal has been delivered before they end their strike action.
Despite efforts to try to restore Stormont, two unions are pressing ahead with Friday's strike.
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The British and Irish governments published the text of a draft deal on Thursday night
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More than 2,000 appointments are cancelled and the health board expects "significant disruption".
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The Department of Health says it is not too late for trade unions to defer industrial action.
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