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Characteristics of the included studies.
| Characteristics | Studies (N=82), n | |
| Paper status | ||
|
|
Preprint | 72 |
|
|
Published | 10 |
| Submission month | ||
|
|
February | 13 |
|
|
March | 53 |
|
|
April | 16 |
| Country of publication | ||
|
|
China | 41 |
|
|
US | 9 |
|
|
India | 6 |
|
|
Turkey | 5 |
|
|
Canada | 4 |
|
|
UK | 3 |
|
|
Bangladesh | 2 |
|
|
Austria | 1 |
|
|
Egypt | 1 |
|
|
Greece | 1 |
|
|
Hong Kong | 1 |
|
|
Hungary | 1 |
|
|
Japan | 1 |
|
|
Korea | 1 |
|
|
Netherlands | 1 |
|
|
Pakistan | 1 |
|
|
Qatar | 1 |
|
|
Sudan | 1 |
|
|
Switzerland | 1 |
