No purchase necessary. Purchasing does not improve your chances of winning. Sweepstakes ends 11:59 p.m. CSTÂ January 31, 2008. Open to all legal U.S residents and must be used and installed in a medical facility located in the continental U.S. Void where prohibited by law. All federal, state and local regulations apply. One online entry per email account. Click here to view the full terms and conditions.All fields with a * are required.