Siotos, C., Stergios, K., Naska, A., Frountzas, M., , Perrea, D., & Nikiteas, N. (2018). The impact of fast track protocols in upper gastrointestinal surgery: A meta-analysis of observational studies. The Surgeon : Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland. https://doi.org/10.1016/j.surge.2017.12.001 (Original work published 2018)