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A lack of B12 can lead to anemia (not having enough red blood cells), which causes you to feel tired and weak
20 We assessed the risk of bias for randomization process, deviations from intended interventions, missing outcome data, measurement of outcome, selection of reported results, and other biases
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Do , rt kh ni c n c em li nguy hi g cho sc khe hay n gin l lm da sng p hn nh cch bi ngoi da thng thng ", PGS.TS Trn Hng Cn ni
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