Epidemiology of Male Hypogonadism Regulation of the Hypothalamic-Pituitary-Testicular Axis: Pathophysiology of Hypogonadism Diagnosis and Evaluation of Hypogonadism Accurate Measurement and Harmonized Reference Ranges for Total and Free Testosterone Levels Testosterone Replacement Therapy in Hypogonadal Men Monitoring of Testosterone Replacement Therapy to Optimize the Benefit-to-Risk Ratio The Effects of Testosterone Treatment on Cardiovascular Health Testosterone Treatment and the Risk of Prostate Adverse Events Fertility Considerations in Hypogonadal Men The Benefits and Risks of Testosterone Treatment in Older Hypogonadal Men Testosterone, Diabetes Risk, and Diabetes Prevention in Men Testicular Dysfunction Among Cancer Survivors Testosterone Treatment As a Function-Promoting Therapy in Sarcopenia Associated with Aging and Chronic Disease Body Image Disorders and Anabolic Steroid Withdrawal Hypogonadism in Men Optimized Use of the Electronic Health Record and Other Clinical Resources to Enhance the Management of Hypogonadal Men