This was not written by the NIH. They catalog medical journal articles like these (not written by them) from various journals, and make them available to the public. It even says at the bottom of the article: "The views and opinions expressed in this article are those of the authors and do not necessarily reflect the official policy or position of the Journal or its management." At the top it clearly states (you have to click the link to get the full name) that the journal is called, "Surgical Neurology International".