The prevalence of<unk>  is age-dependent. The prevalence increases from fewer than 20% at age 40 to approximately 60% by age 60.  At young age (<50 years), males are more commonly affected with<unk>  than females, but there is a female preponderance after the age of 40-50 years. Caucasian individuals are at higher risk of developing<unk>  compared with Asian and non-African Black individuals.<unk>  is more commonly diagnosed in developed countries than in developing countries.
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