Study: too many stool tests.
Ringel
M
M
D001432:Bacteriology / Q000191:economics / Q000592:standards*; D003362:Cost-Benefit Analysis; D017598:Efficiency, Organizational; D005243:Feces / Q000382:microbiology*; D006801:Humans; D010274:Parasitology / Q000191:economics / Q000592:standards*