Systematic review and Covidence question:

When setting up a Covidence project in which a lead researcher will screen 100% of papers, and a second person will screen 10%, is it better to set up the 'reviewers required to screen' as 1 or 2?

Bonus question: if someone has already screened with the 'reviewers required to screen' set at 1, can a second person still review 10%? Or has that horse bolted, at least for that Covidence project? Thanks!

#SystematicReviews
#Covidence