Alrefaee, J., جنان, D. McMillan, دونالد, R. Carter, روجر, J. Nally, and جین. “The Relationship Between Cardiopulmonary Exercise Testing (CPET), Other Related Factors and Outcomes in Patients Undergoing Major Upper Gastrointestinal Surgery”. Annals of the College of Medicine, Mosul, vol. 41, no. 1, June 2025, pp. 1-10, doi:10.33899/mmed.2019.161246.