Great paper! Sorry to nitpick, because your approach is right, but one important detail is wrong - you are not reading what NIH said, but simply a paper made by someone that NIH provides access to. It is important to remember that things on pubmed can be wrong, or subjective and biased.
See header "As a library, NLM provides access to scientific literature. Inclusion in an NLM database does not imply endorsement of, or agreement with, the contents by NLM or the National Institutes of Health.", and you can click on "Author information" to learn more about the authors.
See header "As a library, NLM provides access to scientific literature. Inclusion in an NLM database does not imply endorsement of, or agreement with, the contents by NLM or the National Institutes of Health.", and you can click on "Author information" to learn more about the authors.