Peptic ulcer in twentieth-century America.
Rutgers University, USA.
Gerald N
GN
Grob
D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D010437:Peptic Ulcer / Q000453:epidemiology / Q000266:history*; D014481:United States / Q000453:epidemiology