Find the indicated partial derivative. 
Definitions:
Intussusception
A medical condition where part of the intestine folds into another section of the intestine, leading to blockage.
Melena
The passage of black, tarry stools, indicative of gastrointestinal bleeding.
GI Series
A series of diagnostic tests that produce images of the gastrointestinal tract to detect abnormalities or diseases.
Barium
A chemical element with the symbol Ba, number 56 on the periodic table, used primarily in X-ray imaging to improve the contrast of the images.
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