Multicenter U. S. bilateral MED-EL cochlear implantation study: speech perception over the first year of use - Buss, E; Pillsbury, H C; Buchman, C A; Pillsbury, C H; Clark, M S; Haynes, D S; Labadie, R F; Amberg, S; Ronald, P S; Kruger, P; Novak, M A; Wirth, J A; Black, J M; Peters, R; Lake, J; Wackym, P A; Firszt, J B; Wilson, B S; Lawson, D T; Schatzer, R; D‘Haese, P S; Barco, A L (Ear and hearing, 2008)