Study Chen et al (2020)N = 99, confirmed casesRetrospective study Wang et al (2020)N = 138, confirmed cases Retrospective study Guan et al (2020)N = 1099, confirmed casesRetrospective study Li et al (2020)N = 1994, confirmed casesMeta-analysis, 10 studies Tang et al (2020)N = 449, confirmed casesProspective study Zhou et al (2020)N = 191, confirmed casesRetrospective study