title: [Yan Chunxi and his Mastery of obstetrics] (Chi).
authors.forename: J S
authors.initials: JS
authors.lastname: Guo
mesh_terms: D002681:China; D049690:History, Ancient; D049692:History, Early Modern 1451-1600; D049691:History, Medieval; D049711:History, Modern 1601-; D009774:Obstetrics / Q000266:history*