The court heard six hours of arguments yesterday and spent several hours deliberating that - and a handful of other cases - before announcing it would issue a decision this morning.
Italian prosecutors asked the high court to throw out the acquittal in the murder of 21-year-old British student Meredith Kercher.
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Dr Michio Hirano denied having any financial interest in the experimental treatment considered for the baby.
The measures are set to be included in a court-mandated clean air strategy the Government is due to publish on Wednesday.