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motion-sickness × 2
virus × 1
vaccination × 1
digestion × 1
prevention × 1
alcohol × 1
sleep-cycles × 1
lifestyle × 1
intestine × 1
diarrhea × 1
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geography × 1
nausea × 1
circadian-rythym × 1
bloated-bloating × 1
thrombosis × 1
barotrauma × 1
measles × 1
e-coli × 1
1st-trimester × 1
heart-transplant × 1