the study will be carried out to standardize normal parameters of vascular duplex ultrasound of the cranial vessels in the Egyptian population.
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Normal intimal-medial thickness measured in millimeter
Timeframe: 24 months
Normal vessels' diameter measured in millimeter
Timeframe: 24 months
Normal peak flow velocity measured in cm/sec
Timeframe: 24 months
Normal indices
Timeframe: 24 months