A trial judge may reject medical expert opinions where those opinions are based on incomplete, inaccurate or grossly exaggerated histories provided by the plaintiff, even where no cross-examination of the experts occurred. The onus of disproving a causative relation (the 'thin skull' rule) only arises once a positive finding has been made that the defendant's negligence was a contributing cause of the injury; where the plaintiff fails to establish causation in the first place, the defendant need not disentangle other possible causes.
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