1 Department of Social and Behavioral Sciences, Yale University School of Public Health, New Haven, Connecticut, USA.
2 Section of Geriatrics, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.
3 Emory University Nell Hodgson Woodruff School of Nursing, Atlanta, Georgia, USA.
4 Department of Management, Policy and Community Health, University of Texas Health Science Center at Houston, School of Public Health, Houston, Texas, USA.