Manzano, Roberta Munhoz, Celso Ricardo Fernandes de Carvalho, Beatriz Mangueira Saraiva-Romanholo, and Joaquim Edson Vieira. 2008. “Chest Physiotherapy During Immediate Postoperative Period Among Patients Undergoing Upper Abdominal Surgery: Randomized Clinical Trial”. São Paulo Medical Journal 126 (5):269-73. https://periodicosapm.emnuvens.com.br/spmj/article/view/2000.