title: Returning to the roots of endocrinology: the challenge of evaluating in vivo glandular secretory activity.
authors: J D
authors: JD
authors: Veldhuis
authors: M L
authors: ML
authors: Johnson
mesh_terms: D000818:Animals; D004702:Endocrine Glands / Q000378:metabolism*; D004704:Endocrinology; D006728:Hormones / Q000378:metabolism*; D006801:Humans; D012107:Research Design
chemical_list: D006728:Hormones