Assisting at gastroscopy.
Schindler
Gabriele
G
Schindler
Rudolf
R
D004945:Esophagoscopy / Q000266:history* / Q000379:methods; D005773:Gastroscopy / Q000266:history* / Q000379:methods; D049673:History, 20th Century; D006801:Humans; D014481:United States