Determining plasma morphine levels using GC-MS after solid phase extraction to monitor drug levels in the postoperative period . Clinics, [S. l.], v. 63, n. 3, p. 307–314, 2008. DOI: 10.1590/S1807-59322008000300004. Disponível em: https://www.revistas.usp.br/clinics/article/view/17798.. Acesso em: 17 jun. 2024.