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)