Ting Zhan, et al. “Clinical Characteristics of 195 Cases of COVID-19 With Gastrointestinal Symptoms COVID-19 With Gastrointestinal Symptoms”. Turkish Journal of Gastroenterology, vol. 32, no. 2, Feb. 2021, pp. 148-54, https://tjg.avesjournals.com/index.php/tjg/article/view/4014.