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Vitamin B12 Injection After Gastric Surgery or Gastrointestinal Illness Gastric surgery and gastrointestinal illnesses impair intrinsic factor and stomach acid production, both necessary for oral vitamin B12 absorption

Altitude hypobaric hypoxia leading to hypoxemia triggers high-altitude sickness, although the precise mechanisms remain poorly understood

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10.1016/j.jfo.2019.03.033 10

Gosner KLA (1960) Simplified table for staging anuran embryos and larvae with notes on identification