Abdi, S.; Sahraie, R.; Malekpour, H.; Ashtari, S.; Jahani-Sherafat, S.; Iranshahi, M.; Frootan, M. The High Frequency of Esophageal Disorders in Iranian Patients With Non-Cardiac Chest Pain. Gastroenterol Hepatol Bed Bench 2018, 11, s32-s38.