[Mediterraneo10]

Agreed. Within my own field, there are less than 10 people who are presently working on the same topics as I do. Consequently, we are constantly asked to review each other’s papers, and it is pretty trivial to tell who the author is, either because of the views and interests shown in the paper, or because of language use (i.e. you can tell that the author is a native speaker of the language in which the paper was written, or from their unidiomatic skills in it you can often guess at their native language).

The hard part in this is remaining silent and pretending you don’t know anything about this, when you meet your peers at conferences.