TABLE 1.

Age groups used in the current study.

Age group	Age range	Number of samples	Mean age±SD
	(Years)		(Years)
Young	20–43	100	29.8 ± 5.4
Middle-aged	$>$ 43–63	50	51.2 ± 6.7
Old	$>$ 63-91	35	72.9 ± 6.0