The guidelines posted here should be a good start.:
This blog post is also important:
The closest example I can recall that uses actual data is this older paper by Altman and Bland that compared the common changes from baseline to the (correct) ANCOVA method. They show by simple algebra that the changes from baseline inflates \alpha by at least a factor of 2.
https://academic.oup.com/ajcn/article/102/5/991/4564432?login=true