Schizas, D. Theochari, N.A. Katsaros, I. Mylonas, K.S. Triantafyllou, T. Michalinos, A. Kamberoglou, D. Tsekrekos, A. Rouvelas, I., Pseudoachalasia: a systematic review of the literature, Annals of Esophagus, (17), 216-222, 2020, Springer-Verlag,