What is the difference between in 8b and 8c "survey collection mechanisms" and "details on subject selection"?
I think all points in "Extra" are important (except maybe IRB, but I am not too familiar with these experiment processes, so I might be wrong) and they were listed in DAP of a lot of TOP5 Journals (see comparison in DAP matrix,Sheet1).
https://static.primary.prod.gcms.the-infra.com/static/site/ej/document/Checklist_for_authors_July2020.pdf?node=d63a8d83ba1a1421c6f1&version=263849:ae02e800bfdafd0dbf0f