This was a clinical study and of the clinical studies I've seen they have been recorded to enable the researchers the ability to go back and check the particular respondents participation or answers given if questions arise. So are you saying they lied and didn't report their findings accurately?You knew that if authors set up the videotape of subjects, they are required to report information based on a video analysis. If authors did this, it should be reported in the study. They already have analyzed parents' interviews, which is a part of the study, so they could provide the data based on that.
I hope you've done thesis reports during your college days.
Yes, I did, but that was a long time ago.