Is there an optimal number of suggested posts?

Articles on blogs/magazines often have a list of "suggested posts" at the end of each article.

Obviously, different sites might have better results with a different number of suggested posts. However, since I can't run testing myself at this time, and since there is probably similarity between most sites in terms of performance, I'm wondering if there is any research on what the optimal amount of suggested posts is.

An example would be if there is research showing that suggesting only 3 posts leads to better click-through rates than suggesting 4 posts because it reduces the number of choices, or if there is research showing that an odd number of posts is preferable.