Lubis, Masrul, and Yolanda Anastasia Sianturi. 2023. “Incidence and Characteristic of Gastroesophageal Reflux Disease (GERD): Before and During Covid-19 Pandemic”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy 24 (2):116-21. https://doi.org/10.24871/2422023116-121.