GH feedback occurs through modulation of hypothalamic somatostatin under cholinergic control: studies with pyridostigmine and GHRH. - Ross,RJ.; Tsagarakis,S.; Grossman,A.; Nhagafoong,L.; Touzel,RJ.; Rees,LH.; Besser,GM. (Clin Endocrinol (Oxf), 1987)