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hugo nicolau blind mobile touchscreen text-entry motor impaired braille interact11 tremor accessibility invisuais acessibilidade tetraplegic mobacc entry text 颈苍迟别谤补肠莽茫辞 texto touch interaccao'10 visually impaired vibration vibrotactile assets output touch screen input impaired dsai orientation guide multitouch smartphone performance voiceover typing speed visually-impaired errors 辞谤颈别苍迟补莽茫辞 guia 尘贸惫别濒 blobby learning mobility walking interaction survey proposal phd rita pereira elderly gama teresa read assets'10 assets'09 navtap mobilehci'10 brailletype feedback spellchecker phd proposal impairments