Speech perception benefits of sequential bilateral cochlear implantation in children and adults: a retrospective analysis. - Zeitler DM; Kessler MA; Terushkin V; Roland TJ Jr; Svirsky MA; Lalwani AK; Waltzman SB (Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology, 2008)