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Comm’n of Ariz., (“A lay person does not possess the knowledge necessary to make an accurate diagnosis or to describe a condition’s etiology.

Comm’n, (collecting cases).

Comm'n, 3 COSTCO/HELMSMAN v. BARRETT Decision of the Court

Comm’n, (citing Yates v. Indus.

Comm’n, see also Ariz. Const. art. 18, § 8 (providing for a scheme of workers’ compensation benefits “to be paid to any such workman, in case of his injury”); A.R.S.

Comm’n, (holding that expert medical opinion is required to demonstrate a causal relationship between the industrial injury and claimant’s condition where the causal relationship is not readily apparent to a layperson).

Comm’n, -28 (App. 1982).

Comm’n, -28, -59 (App. 1982) (unless industrial accident causes injuries that are obvious to a layman, expert medical evidence is required to establish a causal relationship between accident and its alleged consequences).

Comm’n, (“While there may be .

Comm’n, - 28, -59 (App. 1982)).

Comm’n, -28, -59 (App. 1982).

Comm’n, -28, -59 (App. 1982).

Comm’n, - 28, -59 (App. 1982).

Comm’n, -28, -59 (App. 1982).

Comm’n, (“While there may be other such injuries that are readily apparent to a layman, typical conditions of the back and spine clearly are not.”); see also, e.g., Chapman v. Powers, 331 N.E.2d 593, 597 (Ill.