nostr:npub1p0luyrzpr8ru3wardtuq822k4lkuzrfegksyv8jwtdjay3q8659sq6wk64 
The original article is linked at the bottom of the medicalxpress summary, where it says the data aren’t designed to answer “why”:

https://cdn.mastdn.ca/media_attachments/files/111/172/922/064/280/461/original/8138827bf45eeab8.jpeg