From the University of Rochester Medical Center (M.A.S., E.C., R.C.G.), Rochester, NY; Muscular Dystrophy Association (V.A.C., J.M.W.), Tucson, AZ; Cystic Fibrosis Foundation (B.C.M.), Bethesda, MD; and American Academy of Neurology (T.S.G.), Minneapolis, MN. (At 2013-02-05)