Arginine and growth hormone-releasing hormone restore the blunted growth hormone-releasing activity of hexarelin in elderly subjects. - Arvat,E.; Gianotti,L.; Grottoli,S.; Imbimbo,P.; Lenaerts,V.; Deghenghi,R.; Camanni,F.; Ghigo,E. (J Clin Endocrinol Metab, 1994)