research at least 3 papers

/by

Parathyroid Hormone (PTH) test

1) PTH, mechanism of action

2) Primary, secondary, tertiary hyperparathyroidism

3) what are vitamin D levels in primary hyperparathyroidism

you have to answer all these questions are above

I need the references and put it in paper number 4

Please do not copay any paper from websites or any work for somebody because my Dr used some website to check students work the website as Plagiarism and Turnitin.

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