1. Department of Public Health Sciences, University of Virginia, P.O. Box 800717, Hospital West Complex, Charlottesville, VA 22908, USA, Email: rsv9d@virginia.edu, Telephone: 434-982-2510
2. School of Informatics and Computing, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
3. Department of Biomedical Informatics, Vanderbilt University, Nashville, TN, USA
4. School of Information and Department of Health Behavior and Health Education, University of Michigan, Ann Arbor, MI, USA