I looked at the most cited paper between those who cite the paper in object: https://care.diabetesjournals.org/content/25/2/275.short

It states: "Mean BGwas determined using area-under-the curve analysis (10)." where (10) is the paper we are discussing about.

Hence in this paper they acknowledge the result...

Don't know about the other citers. Also It would be nice to know that, but I cannot immagine how to do it automatically