Search strategy from Web of Science
| # 4 | #3 AND #2 AND #1 |
| # 3 | TS=(randomised controlled trial OR controlled clinical trial OR randomized OR single-arm trial OR retrospective study OR placebo OR drug therapy OR randomly OR trial OR groups) |
| # 2 | TS=(COVID-19 OR Novel Coronavirus Pneumonia OR 2019-nCoV OR SARS-CoV-2) |
| # 1 | TS=(glycyrrh* OR glycyrrhizic acid OR monopotassium glycyrrhizinate OR monoammonium glycyrrhizinate OR compoundammonium glycyrrhizinate OR compound glycyrrhizin OR compoundmonoammonium glycyrrhizinate OR diammonium glycyrrhizinate OR glycyrrhizic acid preparation OR magnesium isoglycyrrhizinate) |