Xia Lin -
College of Information Science and Technology, Drexel University, Philadelphia, PA 19104, USA
Andreas Kerren -
Computer Science Department, School of Mathematics and Systems Engineering, Växjö University, Vejdes Plats 7, Room B323, SE-351 95, Växjö, Sweden
Jiaje Zhang -
School of Health Information Sciences, University of Texas at Houston, 7000 Fannin, Suite 600, Houston, TX 77030, USA