PMC:7781502 / 425-715 2 Projects
Annnotations
| Id | Subject | Object | Predicate | Lexical cue |
|---|---|---|---|---|
| T7 | 45-52 | Sentence | denotes | Methods |
| T8 | 53-151 | Sentence | denotes | We retrieved all articles on COVID-19 indexed in PubMed between 31 December 2019 and 30 June 2020. |
| T9 | 152-216 | Sentence | denotes | We identified the countries of individual authors’ affiliations. |