Cheung K. S., Hung I. F. N., Chan P. P. Y., Lung K. C., Tso E., Liu R.., et al.,
2020, Gastrointestinal Manifestations of SARS-CoV-2 Infection and Virus Load in Fecal
Samples From a Hong Kong Cohort: Systematic Review and Meta-analysis, Gastroenterology,
Vol. 159, No. 1, pp. 81-95