Perry et al. (37) studied 65 African-American males in the United States (age range 70–102 years) and found an annual peak for testosterone in winter.

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• Person: Not available Organization: Frontiers
  Seasonal Changes of Serum Gonadotropins and Testosterone in ...

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• Seasonal Changes of Serum Gonadotropins and Testosterone in ... www.frontiersin.org Frontiers via serper

Referenced by nodes (2)

• testosterone concept
• U.S. location