For example, one study in 2013 concluded that alopecia is likely not associated with B12 deficiency
Other approaches include stool analysis to assess gut bacteria, inflammation, and digestive function, as well as testing zonulin levels, a protein that regulates intestinal permeability
A note that reads: "Patient returns from India, 5 days of watery stools, onset day 4 of travel, stool culture sent, impression: traveler's diarrhea, likely infectious gastroenteritis" supports A09 on initial submission
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