From the Harvard Medical School, Department of PM&R, Spaulding Rehabilitation Hospital, Boston, Massachusetts (SP); and Universidad de Puerto Rico, San Juan, Puerto Rico (WRF).

All correspondence should be addressed to: Sabrina Paganoni, MD, PhD, Massachusetts General Hospital, 165 Cambridge St, Suite 600, Boston, MA 02114.

Financial disclosure statements have been obtained, and no conflicts of interest have been reported by the authors or by any individuals in control of the content of this article.