Comparison between oral midazolam versus oral ketamine plus midazolam as preanesthetic medication in autism spectrum disorder: double-blind randomized clinical trial oleh Heber de Moraes Penna, Andreia Portela Martins Paiva, Antônio José Marques Romano, Rodrigo Leal Alves, Paulo do Nascimento Junior, Norma Sueli Pinheiro Módolo