According to the ranking of the rating agency Expertscape, Giampaolo Perna ranks 1st among the experts for panic disorder in Italy and Europe and among the first three Worldwide. In the context of the entire category of anxiety disorders he rank first among the greatest Italian experts. (2017-2022)

Expertscape is a rating agency whose rating is based on an objective calculation (ie not manipulated) that is based on scientific publications of the last decade assessing the quality of the journal, the position as an author in the article, the fact that it is a recent publication or not.