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Abstract
This study was conducted on 450 apparently normal subjects (ranging in age from 0.75 to 75 years old with an average 23 ±20 year) categorized into eight different study groups according to age: group I comprized of 58 subjects of age less than 1 year, group II comprized of 64 subjects of age from 1 to 5 years, group III comprized of 53 subjects of age from 6 to 10 years, group IV comprized of 47 subjects of age from 11 to 20 years, group V comprized of 97 subjects of age from 21 to 30 years,