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Table 1. 
COVID-19 queries for a range of scholarly sources
SourceQueryScope/YearComments
Google Scholar "COVID-19" Full text 2019–2020 OR does not work False matches. 
Dimensions "COVID-19" OR "Novel coronavirus" OR "2019-nCoV" OR "SARS-CoV-2" OR "coronavirus 2" OR "Coronavirus disease 2019" OR "Corona virus disease 2019" Full text 2019–2020   
PubMed ((((((("COVID-19") OR "Novel coronavirus") OR "2019-nCoV") OR "SARS-CoV-2") OR "coronavirus 2") OR "Coronavirus disease 2019") OR “Corona virus disease 2019”) AND ("2019/12/01"[Date - Publication] : "3000"[Date - Publication]) All metadata from Dec 2019   
Mendeley "COVID-19" Probably metadata3 OR does not work. 
medRxiv and bioRxiv Self-reported repository statistics for self-curated collection. Full text Repository statistics for COVID-19 SARS-CoV-2 preprints from medRxiv and bioRxiv4. 
Scopus (ALL ("COVID-19") OR ALL ("Novel coronavirus") OR ALL ("2019-nCoV") OR ALL ("SARS-CoV-2") OR ALL ("coronavirus 2") OR ALL ("Coronavirus disease 2019") OR ALL ("Corona virus disease 2019")) AND PUBYEAR = 2020 OR PUBDATETXT (december 2019) All metadata 2019–2020   
WoS Core Collection TOPIC=("COVID-19" OR "Novel coronavirus" OR "2019-nCoV" OR "SARS-CoV-2" OR "coronavirus 2" OR "Coronavirus disease 2019" OR "Corona virus disease 2019") All metadata 2019–2020 Including Conference Proceedings Citation Index. 
PMC (((((((("COVID-19") OR "Novel coronavirus") OR "Novel coronavirus") OR "2019-nCoV") OR "SARS-CoV-2") OR "coronavirus 2") OR "Coronavirus disease 2019") OR "Corona virus disease 2019") AND ("2019/12/01"[Publication Date] : "3000"[Publication Date]) Full text from Dec 2019   
ClinicalTrials.gov COVID OR "SARS-CoV-2" OR "2019-nCoV"   Query predefined statistics5. 
SourceQueryScope/YearComments
Google Scholar "COVID-19" Full text 2019–2020 OR does not work False matches. 
Dimensions "COVID-19" OR "Novel coronavirus" OR "2019-nCoV" OR "SARS-CoV-2" OR "coronavirus 2" OR "Coronavirus disease 2019" OR "Corona virus disease 2019" Full text 2019–2020   
PubMed ((((((("COVID-19") OR "Novel coronavirus") OR "2019-nCoV") OR "SARS-CoV-2") OR "coronavirus 2") OR "Coronavirus disease 2019") OR “Corona virus disease 2019”) AND ("2019/12/01"[Date - Publication] : "3000"[Date - Publication]) All metadata from Dec 2019   
Mendeley "COVID-19" Probably metadata3 OR does not work. 
medRxiv and bioRxiv Self-reported repository statistics for self-curated collection. Full text Repository statistics for COVID-19 SARS-CoV-2 preprints from medRxiv and bioRxiv4. 
Scopus (ALL ("COVID-19") OR ALL ("Novel coronavirus") OR ALL ("2019-nCoV") OR ALL ("SARS-CoV-2") OR ALL ("coronavirus 2") OR ALL ("Coronavirus disease 2019") OR ALL ("Corona virus disease 2019")) AND PUBYEAR = 2020 OR PUBDATETXT (december 2019) All metadata 2019–2020   
WoS Core Collection TOPIC=("COVID-19" OR "Novel coronavirus" OR "2019-nCoV" OR "SARS-CoV-2" OR "coronavirus 2" OR "Coronavirus disease 2019" OR "Corona virus disease 2019") All metadata 2019–2020 Including Conference Proceedings Citation Index. 
PMC (((((((("COVID-19") OR "Novel coronavirus") OR "Novel coronavirus") OR "2019-nCoV") OR "SARS-CoV-2") OR "coronavirus 2") OR "Coronavirus disease 2019") OR "Corona virus disease 2019") AND ("2019/12/01"[Publication Date] : "3000"[Publication Date]) Full text from Dec 2019   
ClinicalTrials.gov COVID OR "SARS-CoV-2" OR "2019-nCoV"   Query predefined statistics5. 
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