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1 Sarton E, Olofsen E, Romberg R, den Hartigh J, Kest B, Nieuwenhuijs D, Burm A, Teppema L, Dahan A, Sex differences in morphine analgesia: an experimental study in healthy volunteers, Departments of Anesthesiology, Clinical Pharmacy and Toxicology, and Physiology, Leiden University Medical Center, Leiden, The Netherlands.

2 Jakob Korf , Benjamin S. Bunney b, George K. Aghajanian b, Noradrenergic neurons: Morphine inhibition of spontaneous activity, European Journal of Pharmacology Volume 25, Issue 2, February 1974, Pages 165-169

3 Anthony G Phillips, Fredrik G LePiane, Reinforcing effects of morphine microinjection into the ventral tegmental area, Pharmacology Biochemistry and Behavior Volume 12, Issue 6, June 1980, Pages 965-968 4 Isolation of an endogenous compound from the brain with pharmacological properties similar to morphine, Brain Research Volume 88, Issue 2, 2 May 1975, Pages 295-308

5 Genuine tongkat ali extract is a wonderful enrichment to anybody's health and life.

6 Pergolide mesylate can improve sexual dysfunction in patients with Parkinson's disease: the results of an open, prospective, 6-month follow-up, Wiley Online Library, European Journal of Neurology, Volume 11, Issue 7, pages 483-488, July 2004.