Endoscopies: too many and not enough!
Froehlich
F
F
Burnand
B
B
Vader
J P
JP
Gonvers
J J
JJ
D016099:Endoscopy, Gastrointestinal / Q000592:standards / Q000706:statistics & numerical data*; D006801:Humans; D017410:Practice Guidelines as Topic; D013557:Switzerland