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A Holyrood inquiry has started into why waiting lists were changed by NHS Lothian.
The most senior NHS bosses in country are being question by MSP's.
Iain Gray, the convener of Holyrood's Audit Committee, said the report left two ``unanswered questions''
The former Labour leader said more information was needed about the ``inexplicable rise'' in the number of patients marked as unavailable for treatment between 2008 and 2011 and the ``sudden plummet'' in this after the problems at NHS Lothian were uncovered.