Where a trial judge must choose between a wide range of factual possibilities in a context where credit has some importance, an appellate court must show substantial, though not complete, deference to the trial judge's opinions. A trial judge is not obliged to accept or reject a medical expert's opinion in its entirety and may synthesise conclusions from multiple medical reports. Defendants are not obliged to compensate plaintiffs irrespective of the possibility that pre-existing conditions would have caused harm in any event, even under the egg-shell skull rule.
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