Opioid modulation of gamma-aminobutyric acid-controlled inhibition of exercise-stimulated growth hormone and prolactin secretion in normal men. - Coiro,V.; Volpi,R.; Maffei,M.L.; Caiazza,A.; Caffarri,G.; Capretti,L.; Colla,R.; Chiodera,P. (Eur J Endocrinol, 1994)