[1] Indiana Univ Indianapolis IUPUI, Sch Informat & Comp, 535 W Michigan St, Indianapolis, IN 46202 USA
[2] Indiana Univ, Bloomington, IN USA
[3] Univ Illinois, Lib Hlth Sci, Chicago, IL USA
[4] Northwestern Univ, Evanston, IL USA
[5] Univ Wisconsin, Informat Sch, Madison, WI USA
[6] CALTECH, Pasadena, CA 91125 USA
[7] Oregon State Univ, Corvallis, OR 97331 USA