Cerrah, Serkan, Ahmed Ramiz Baykan, Sedat Ciftel, and Emre Gerceker. 2021. “From the Point of View of a Gastroenterologist: Is the Ulcer Malign, or Benign?”. Annals of Medical Research 27 (11):2954-57. http://annalsmedres.org/index.php/aomr/article/view/1046.