1. Department of Family and Community Health, University of Pennsylvania School of Nursing, Philadelphia, PA, USA
2. Lab of Infectious Disease Prevention, Lindsley F. Kimball Research Institute, New York Blood Center; Division of Infectious Diseases, Department of Medicine, Columbia University Irving Medical Center, New York, NY, USA
3. Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
4. Independent Consultant, Metuchen, NJ, USA