Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=33792964.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33792964/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33792964
	subscription/membership/fee required	Wiley	https://doi.org/10.1002/jcla.23771
	free resource	Biospecimen Research Database	https://brd.nci.nih.gov/brd/paper/j-clin-lab-anal/2021/stability-and-validity-of-intact-parathyroid-hormone-levels-in/134371
	free resource	scite Smart Citations	https://scite.ai/reports/33792964