[1] Duke Univ, Durham, NC USA
[2] MIT, Cambridge, MA USA
[3] Univ Penn, Philadelphia, PA USA
[4] Univ Pittsburgh, Pittsburgh, PA USA
[5] Highmark Hlth, Pittsburgh, PA USA
[6] Indiana Univ Penn, Indiana, PA USA
[7] Case Western Reserve Univ, Cleveland, OH USA
[8] Case Western Reserve Univ, 10900 Euclid Ave, Cleveland, OH 44106 USA