Software for subjective visual vertical assessment: an observational cross-sectional study - Pavan, Theo Zeferino; Funabashi, Martha; Carneiro, José Ailton Oliveira; Pontelli, Taiza Elaine Grespan dos Santos; Tedeschi, Walfred; Colafemina, Jose Fernando; Carneiro, Antonio Adilton Oliveira (Brazilian Journal of Otorhinolaryngology, 2012)