GastroGPT: Development and controlled testing of a proof-of-concept customized clinical language model - Cem Simsek; Mete Ucdal; Enrique de-Madaria; Alanna Ebigbo; Petr Vanek; Omar Elshaarawy; Theodor Alexandru Voiosu; Giulio Antonelli; Román Turró; Javier P Gisbert; Olga P. Nyssen; Cesare Hassan; et al. (Endoscopy International Open)