Table 2.

Example of PubMed search strategy.

Number	Search Terms
1	Mesh descriptor: (Lianhuaqingwen) explode all trees
2	((((((Lian-Hua Qing-Wen [Title/Abstract]) OR Lianhuaqingwen Capsule [Title/Abstract]) OR LianHua QingWen [Title/Abstract]) OR Lianhua Qingwen [Title/Abstract]) OR Lianhuaqingwen granule [Title/Abstract])
3	Or 1–2
4	Mesh descriptor: (COVID-19) explode all trees
5	((((((2019 novel coronavirus infection[Title/Abstract] OR 2019-nCoV infection[Title/Abstract]) OR COVID-19 pandemic[Title/Abstract]) OR coronavirus disease-19[Title/Abstract]) OR 2019-nCoV disease[Title/Abstract]) OR COVID19[Title/Abstract]) OR 2019 novel coronavirus disease[Title/Abstract]) OR coronavirus disease 2019[Title/Abstract]
6	Or 4–5
7	3 and 6