Retrospective Study
Copyright ©The Author(s) 2021.
World J Clin Cases. Jun 16, 2021; 9(17): 4159-4165
Published online Jun 16, 2021. doi: 10.12998/wjcc.v9.i17.4159
Figure 2
Figure 2 Usage. A: Expansion in two directions; B: Expansion in three directions; C: Expansion in four directions; D: Effect of dilation therapy.