[1] George Washington Univ, Sch Med & Hlth Sci, Washington, DC USA
[2] Univ Cincinnati, Coll Med, Cincinnati, OH USA
[3] Virginia Commonwealth Univ, Sch Med, Richmond, VA USA
[4] Rush Univ, Med Ctr, Chicago, IL USA
[5] Virginia Commonwealth Univ, Sch Med, Richmond, VA 23298 USA