1 Johns Hopkins Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University School of Medicine, 1812 Ashland Avenue, Room 431, Baltimore, MD 21205, USA. Electronic address: sahill@jhmi.edu.
2 University of Maryland School of Medicine, Division of Endocrinology, Diabetes, and Nutrition, 800 Linden Avenue, Baltimore, MD 21201, USA. Electronic address: rmalek@som.umaryland.edu.