1. Department of Health and Community Systems, University of Pittsburgh School of Nursing, Pittsburgh, PA, USA
2. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
3. Department of Nursing, University of Massachusetts Boston, Boston, MA, USA
4. Department of Computer Science and Engineering, University of Massachusetts Boston, Boston, MA, USA
5. Department of Exercise and Health Sciences, University of Massachusetts Boston, Boston, MA, USA