1 Department of Epidemiology, University of Michigan, School of Public Health, United States, 1415 Washington Heights, Ann Arbor, MI, 48104-2029, USA. harlow@umich.edu.
2 Endocrine Division, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, USA.
3 Division of Geriatrics, David Gefen School of Medicine, University of California at Los Angeles, Los Angeles, USA.
4 Department of Social Sciences & Health Policy Wake Forest School of Medicine, Winston-Salem, USA.
5 Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, USA.
6 Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, USA.