Wigmore on Evidence § 1179, at 417 (James H. Chadbourn ed., rev.1972). Therefore, when the content of a document is material to the matter to be proved, the original writing must be produced unless it is unavailable due to an exception and its absence is not attributable to the fault of the party seeking to use it as proof of the contents therein. See Am.Jur.2d supro, § 1049, at 510; C.J.S. supra, §§ 1057, 1059. 138 The rules of evidence provide for exceptions in cases where the originals are lost or destroyed, the original is not obtainable, the original is in the possession of the opponent, 9, 906 (1976) (upholding physician's competence to testify as to reasonableness and necessity of medical services); Milwaukee County v. Long, 189 Wis.2d 489, 527 N.W.2d 398 (App.1994) (per curiam) (<HOLDING>); cf. Arnold Mach. Co. v. Intrusion Prepakt,
holding that statute does not remove plaintiffs burden of proving causation and reasonableness holding that statute allows admissibility of evidence by affidavit to prove reasonableness and necessity of medical expenses holding that statute provides medical bill is admissible to prove amount fairness and reasonableness of charges holding that recovery for medical expenses incurred as result of accident depends on proof of necessity and reasonableness holding that statute does not eliminate plaintiffs burden to prove reasonableness and necessity of past medical expenses