You can find all of the Sexologic Clinic’s research projects (well, all of the hospital’s research is available) here:
However the study these articles mention does not appear to be published on the aforementioned webpage. I’m guessing that the clinic just talked about their findings in a press release or something, and never published a report on it. So I think the best course of action would be to email the sexologic clinic.
PS: I found a lot more articles talking about this study, though probably not worth pasting here because they’re all saying the exact same things to the point of almost just being a copy paste 