| Authors’ contributions | KNi | KNa | SM | KK | MM | MT | YY | KNi | TT |
| Research concept and design | y | n | n | n | n | n | n | y | n |
| Collection and/or assembly of data | y | y | y | n | n | y | y | y | n |
| Data analysis and interpretation | y | y | y | y | y | y | y | y | n |
| Writing the article | y | n | n | n | n | n | n | n | y |
| Critical revision of the article | y | n | n | n | n | n | n | n | y |
| Final approval of the article | y | y | y | y | y | y | y | y | y |