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Data availability All data associated with this study are present in the paper or the Supplementary Information

Zinc plays an essential role in immune cell function

In my own practice, especially if an older person has risk factors for vitamin B12 deficiency, I consider a vitamin B12 level of 200-400 pg/mL borderline, and I usually order a methylmalonic acid level as a follow-up

In accordance with our regulations governing third party intermediaries at 414.1400(a)(3)(iv) and (e)(1), we may take remedial action in the event a third party intermediary fails to meet the criteria necessary for their approval as a third party intermediary, fails to comply with other requirements applicable to third party intermediaries, has submitted a false certification, or discontinues their services and do not assist MIPS eligible clinicians in connecting with a different third party intermediary