An interlocutory order directing that expert reports stand as prima facie evidence of facts relied upon therein, where the opposing party retains the right to lead other evidence, does not give rise to substantial injustice warranting leave to appeal before trial. The party who obtained such an order bears the risk of inadequate proof if the order is later found to lack power or to be unjust. An appellate court should not determine the fairness of such an order in a fluid pre-trial situation where the determination risks producing an advisory opinion.
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