def _create_prediction_annotation(self, prediction, reviewer, allow_duplicated):
        if not allow_duplicated:
            if self._check_duplicated(prediction, reviewer):
                return None
        prev_obj = PredictionReview(
            label=uuid4().hex,
            prediction=prediction,
            slide=prediction.slide,
            reviewer=reviewer
        )
        prev_obj.save()
        return {
            'review_id': prev_obj.id,
            'slide': prev_obj.slide.id,
            'prediction': prev_obj.prediction.label,
            'review_label': prev_obj.label,
            'reviewer': prev_obj.reviewer.username
        }