1. From the Department of Endocrinology and Thyroid Research, Institute of Nuclear Medicine and Allied Sciences, Delhi, India (RKM, RA, BS, and SS); the Departments of Endocrinology and Metabolism (NT, DHKR, and MAG) and Biostatistics (RS), All India Institute Medical Sciences, New Delhi, India; and the Department of Endocrinology, Defence Institute of Physiological Sciences, Delhi, India (RCS)