Breakdown of reviews and manuscripts per type of reviewer.

Percentages are calculated as the fraction of total number of review suggestions/review invitations/reviews, and manuscripts where such information appears per type of reviewer. For example, the first cell (i.e., 5.8% / 23.9%) means author-opposed reviewers were suggested in 5.8% of all review suggestions involving 23.9% of all manuscripts. Similarly, the second cell (i.e., 0.2% / 1.0%) means that author-opposed reviewers were invited to 0.2% of all invitations involving 1.0% of all manuscripts.