USMLE Step 1 Quiz
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BIOSTATISTICS AND EPIDEMIOLOGY
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A study conducted exclusively among hospitalized patients finds a positive association between cholecystitis and pancreatitis. The researchers conclude that cholecystitis is a risk factor for pancreatitis. However, other studies in the general population have not found such a strong association.
The discrepancy in findings is most likely due to which type of bias in the hospital-based study?
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