(August 21, 2015, 1:05 PM EDT) -- PHILADELPHIA — A Pennsylvania Superior Court panel on Aug. 20 affirmed a $4.2 million Topamax birth defect verdict, a ruling that turned on whether the trial judge violated Virginia law in his instructions on the causation standard (April Czimmer v. Janssen Pharmaceuticals, Inc., No. 459 EDA 2014, Pa. Super.)....