Concomitant medication use can confound interpretation of the combined dexamethasone-corticotropin releasing hormone test in Cushing’s syndrome - Valassi, E; Swearingen, B; Lee, H; Nachtigall, L B; Donoho, D A; Klibanski, A; Biller, B M (J Clin Endocrinol Metab, 2009)