Sources consulted:

https://thereader.mitpress.mit.edu/mysteries-of-foreign-accent-syndrome/

https://www.citystgeorges.ac.uk/news-and-events/news/2023/03/american-man-developed-irish-accent-prostate-cancer-foreign-accent-syndrome-explained

https://pmc.ncbi.nlm.nih.gov/articles/PMC4746356/

https://pmc.ncbi.nlm.nih.gov/articles/PMC4746356/

https://en.wikipedia.org/wiki/Foreign_accent_syndrome

https://www.medicalnewstoday.com/articles/foreign-accent-syndrome

https://www.livescience.com/italian-womans-rare-foreign-accent-syndrome-caused-her-to-sound-canadian

https://www.tandfonline.com/doi/abs/10.1080/02687038.2011.573857

https://pubmed.ncbi.nlm.nih.gov/30606457/