 blood flow velocity**                                           **0**                                00.0 ± 00.0    00.0 ± 00.0    \< 0.00    **0**                                00.0 ± 00.0    00.0 ± 00.0    \< 0.00    **00**                               00.0 ± 00.0    00.0 ± 00.0    \< 0.000    **00**                               00.0 ± 00.0    00.0 ± 00.0    \< 0.00    **00**                               00.0 ± 00.0    00.0 ± 00.0    \< 0.000    **