Livingstone's 'alternative hypothesis'.
Ortner
D J
DJ
Livingstone
F B
FB
D049690:History, Ancient; D049692:History, Early Modern 1451-1600; D049691:History, Medieval; D049711:History, Modern 1601-; D010164:Paleopathology / Q000266:history*; D014211:Treponemal Infections / Q000266:history*