Remember that the NIH does not publish (edit: to be clearer this is the National Library of Medicine which falls under the umbrella of the NIH, and its URL), it just organizes articles like a local library but on a much larger scale. It's a common misconception. This article was published by the British Medical Journal as an interesting anecdote from a physical therapist. The NIH makes things available for searching but does not endorse anything that they have available.