Some time ago, I attended a conference. The organizers later compiled an edited book with the revised presentations of the conference. I was also offered to contribute a chapter. But after the sending the organizers a first draft, I had to turn down the offer as I did not have the time to make the revisions and additions they asked for.
Currently, I am writing an omnibus review about the same topic for a journal and I also would like to discuss the meanwhile published proceedings of the conference. Although I think the edited book has some very good points, I also would have to express severe criticism about some other points especially in the introduction by the organizers.
Therefore, I would like to know:
How do I disclose the best in the review that I have participated at the conference and was offered a chapter? Should I add a footnote or a paragraph? Wouldn't that even raise distrust?
To make things more complicated: There is already a well-meaning review of the book by the 2nd supervisor of one of the contributors who has not disclosed his link in any way.