No abstract available
MeSH terms
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Age Factors
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Aged
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Coronary Disease / complications
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Digestive System Surgical Procedures*
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Female
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Gastrointestinal Diseases / surgery*
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Humans
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Male
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Middle Aged
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Pneumonia / complications
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Postoperative Complications
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Preoperative Care
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Pulmonary Atelectasis / etiology
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Pulmonary Embolism / etiology
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Surgical Procedures, Operative*