1. College of Nursing, University of Iowa, Iowa City, Iowa, USA;
2. Department of Biobehavioral Health Sciences, School of Nursing, University of Pennsylvania, Philadelphia, Pennsylvania, USA;
3. Department of Psychosocial and Community Health, School of Nursing, University of Washington, Seattle, Washington, USA;
4. Department of Family and Community Medicine, School of Medicine, University of Missouri, Columbia, Missouri, USA