Treatment-emergent central sleep apnea in a patient with multiple system atrophy: case report - Carolina Almeida Grinfeld; Yasmin de Rezende Beiriz; Thatiana Pereira Silva; Natalia Martins de Araújo; Mirella Pereira Souza Paixão; Julyana Carneiro Gomes; Paulo Sergio Lins Perazzo (Brazilian Journal of Otorhinolaryngology)