Asnis GM, Halbreich U, Ryan ND, et al. The relationship of the dexamethasone suppression test (1 mg and 2 mg) to basal plasma cortisol levels in endogenous depression. Psychoneuroendocrinology 1987; 12: 295.
Maes M, Lin A, Bonaccorso S, et al. Increased 24-hour urinary cortisol excretion in patients with posttraumatic stress disorder and patients with major depression, but not in patients with fibromyalgia. Acta Psychiatr Scand 1998; 98: 328.