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Leonardo Teixeira Domingues Duarte, Maria do Carmo Barretto de Carvalho Fernandes, Verônica Vieira da Costa, Renato Ângelo Saraiva. "The Incidence Of Postoperative Respiratory Depression In Patients Undergoing Intravenous Or Epidural Analgesia With Opioids." Revista Brasileira de Anestesiologia 59.4 (2009) 409-420