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Basic characteristics of studies included in the review
| Category | Value | Total N (%) |
|---|---|---|
| Citations | 0 | 1510 (34.8) |
| 1—5 | 1661 (38.3) | |
| >5 | 1171 (27.0) | |
| Categories of journals | Professional journals | 1991 (45.9) |
| Comprehensive journals | 1654 (38.1) | |
| Others | 697 (16.1) | |
| Identities of the first author | Clinical doctors | 1957 (45.1) |
| Postgraduate students | 740 (17.0) | |
| Researchers | 1645 (37.9) |
