Pourhoseingholi MA, Shojaee S, Ashtari S. Three potential challenges in studying COVID-19 pandemic data: Chinese statistics, social media, and preprint servers . Gastroenterol Hepatol Bed Bench [Internet]. 2020 Sep. 20 [cited 2024 Apr. 30];13(4):278-9. Available from: https://journals.sbmu.ac.ir/ghfbb/index.php/ghfbb/article/view/2011