Sakai, Rafael Luis, Graciela Maria Gera Abrão, José Franscisco Vasques Ayres, Pedro Thadeu Galvão Vianna, Lídia Raquel de Carvalho, and Yara Marcondes Machado Castiglia. “Prognostic Factors for Perioperative Pulmonary Events Among Patients Undergoing Upper Abdominal Surgery”. São Paulo Medical Journal 125, no. 6 (November 11, 2007): 315–321. Accessed October 16, 2025. https://periodicosapm.emnuvens.com.br/spmj/article/view/2180.