453 A.2d 723 Karen A. Girovsky, Petitioner v. Workmen’s Compensation Appeal Board (Corry Foam Products, Inc.), Respondents. Commonwealth Court of Pennsylvania.Argued October 7, 1982 December 28, 1982. Workmen’s compensation — Burden of proof — Causal connection — Pre-existing condition. 1. In a workmen’s compensation case, it is claimant’s burden to prove a causal connection between […]