| Authors’ contributions | MQ | RU | ATR | KV | IF |
|---|---|---|---|---|---|
| Research concept and design | ✓ | -- | ✓ | -- | ✓ |
| Collection and/or assembly of data | ✓ | ✓ | -- | -- | ✓ |
| Data analysis and interpretation | ✓ | ✓ | ✓ | ✓ | ✓ |
| Writing the article | ✓ | ✓ | ✓ | -- | ✓ |
| Critical revision of the article | -- | -- | ✓ | ✓ | ✓ |
| Final approval of article | ✓ | ✓ | ✓ | ✓ | ✓ |
| Statistical analysis | ✓ | -- | ✓ | ✓ | -- |
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