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Papaefthymiou, Apostolis, Apostolos Koffas, Jannis Kountouras, Michael Doulberis, Agoritsa Kaltsa, Fotis Tsiopoulos, Grigorios Christodoulidis, Andreas Kapsoritakis, و Spyros Potamianos. "The Impact of COVID-19 Pandemic On Gastrointestinal Diseases: A Single-center Cross-sectional Study in Central Greece." Ann Gastroenterol 2021.

Papaefthymiou, Apostolis, et al. "The Impact of COVID-19 Pandemic On Gastrointestinal Diseases: A Single-center Cross-sectional Study in Central Greece." Ann Gastroenterol 2021.