No abstract available
MeSH terms
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Adult
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Aged
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Carcinoembryonic Antigen / analysis*
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Circadian Rhythm*
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Digestive System Neoplasms / blood*
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Digestive System Neoplasms / physiopathology
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Female
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Humans
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Male
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Middle Aged
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alpha-Fetoproteins / analysis*
Substances
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Carcinoembryonic Antigen
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alpha-Fetoproteins