C. A. 3d Cir. Motions of Medical Device Manufacturers Association, Danek Medical, Inc., Product Liability Advisory Council, Inc., and Pharmaceutical Research and Manufacturers of America for leave to file briefs as amici curiae granted. Certio-rari granted limited to the following question: “Whether federal law pre-empts state-law tort claims alleging fraud on the Food and Drug Administration during the regulatory process for marketing clearance applicable to certain medical devices?”