Figure Legends:
Fig 1 The researching flow chart.
Fig2. Comparison of Optimized group and Control group(A), Optimized
supine group and the corresponding control group(B), Optimized lithotomy
group and the corresponding control group (C).(*** P<0.0001)
Fig3. Comparison of each procedure in optimized supine group and the
corresponding control group. (*** P <0.0001)
Fig4. Comparison of each procedure in optimized lithotomy group and the
corresponding control group. (*** P <0.0001)