Frieboes, R. M., Murck, H., Antonijevic, I. A., & Steiger, A. (1999). Effects of growth hormone-releasing peptide-6 on the nocturnal secretion of GH, ACTH and Cortisol and on the sleep EEG in man: role of routes of administration. Journal of Neuroendocrinology, 11, 473-478.