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Where an injury or disease has been diagnosed by the ADF Medical Service prior to the member's discharge, it may be possible to determine liability on the basis of existing documents (i.e. where the factual circumstances leading to the onset of the diseas — e, are clear). Delegates, not doctors, are the decision makers. A formal medical opinion by a doctor on the causation of an injury or a disease is not necessary if the medical facts of the matter are already evident to the Delegate, i.e. on the basis of th — e available papers.