Melatonin exerts direct inhibitory actions on ACTH responses in the human adrenal gland - Campino, C; Valenzuela, F J; Torres-Farfan, C; Reynolds, H E; Abarzua-Catalan, L; Arteaga, E; Trucco, C; Guzman, S; Valenzuela, G J; Seron-Ferre, M (Horm Metab Res, 2011)