Procedure time ( @,@ -LSB- @,@-@ ,@ -RSB- vs. @,@ -LSB- @,@-@ ,@ -RSB- sec , p = ns ) and fluoroscopy time ( @ -LSB- @-@ -RSB- vs. @ -LSB- @-@ -RSB- sec , p = ns ) were not significantly different , but the radiation dose was significantly higher in the TR group ( @ -LSB- @-@ -RSB- vs. @ -LSB- @-@ -RSB- Gy * cm@ , p < @ ) by per-protocol analysis .