In the Viking era, boats from what is now Denmark travelled west across the North Sea to invade what is now Great Britain, but boats from what is now Sweden travelled south across the Baltic Sea and took rivers deep into what is now southern Europe, where they may have left a genetic trail. This southern European survey shows that the prevalence of Dupuytren’s in Bosnia and Herzegovina is higher than one might expect, with a somewhat different age distribution compared to surveys of northern Europe, and the novel finding of a predominance of right hand involvement: https://www.dupuytrens.org/DupPDFs/2004_Zerajic_1030.pdf
