1. Department of Medicine, Division of Endocrinology; Mayo Clinic College of Medicine; Rochester MN USA
2. Robert and Arlene Kogod Center on Aging; Rochester; MN USA
3. Laboratory of Endocrinology and Receptor Biology; National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK); National Institutes of Health (NIH); Bethesda MD USA
4. Department of Biochemistry and Molecular Biology; Mayo Clinic College of Medicine; Rochester MN USA