Chinese herbal medicine Shufeng Jiedu Capsule for patients with mild to moderate coronavirus disease 2019 (COVID-19): Protocol for a randomized, blinded, placebo control trial

•Robust methodology design was applied in Chinese herbal patent medicine for COVID-19.•Efficacy of Shufeng Jiedu capsules will be verified by randomized controlled trial.•Decentralized methods will be applied to collect patients reported outcomes in this trial.