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A meta-analysis uses statistical techniques to synthesize effect estimates from multiple studies. A systematic review may or may not include meta-analysis.

Elemental/semi-elemental formulas provide predigested nutrients, reducing digestive/absorptive demands in malabsorption.

Odds ratio is used in case-control studies to compare exposure odds between cases and controls.

HbA1c reflects average blood glucose over ~3 months.

Classic galactosemia requires lifelong elimination of lactose and galactose (milk, dairy, some medications). Soy-based or elemental formulas are used in infants.