[1] Univ Pittsburgh, Dept Computat & Syst Biol, Sch Med, Pittsburgh, PA 15260 USA
[2] Edward Via Coll Osteopath Med, Div Biomed, Blacksburg, VA 24060 USA
[3] Oregon Hlth & Sci Univ, OHSU Ctr Spatial Syst Biomed, Portland, OR 97201 USA
[4] Oregon Hlth & Sci Univ, Dept Biomed Engn, Portland, OR 97201 USA