Use of methadone as an alternative to morphine for chronic pain management: a noninferiority retrospective observational study by Guilherme Antonio Moreira de Barros, Ricardo Baradelli, Debora Garcia Rodrigues, Odaly Toffoletto, Flavia Seullner Domingues, Maisa Vitoria Gayoso, Alexandre Lopes, Jorge Barros Afiune, Gabriel Magalhães Nunes Guimarães

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