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Fig 1.

Flow chart of study selection process.

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Table 1.

Characteristics of included studies.

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Fig 2.

Forest plot of showing the effects of caffeine vs aminophylline on the effective rate of 1–3 days.

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Fig 3.

Forest plot of showing the effects of caffeine vs aminophylline on tachycardia.

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Fig 4.

Forest plot of showing the effects of caffeine vs aminophylline on feeding intolerance.

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Fig 5.

Forest plot of showing the effects of caffeine vs aminophylline on hyperglycemia.

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Fig 5 Expand

Fig 6.

Forest plot of showing the effects of caffeine vs aminophylline on total adverse effects.

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Fig 6 Expand