Letters To The Editor
Copyright ©2013 Baishideng Publishing Group Co.
World J Cardiol. Oct 26, 2013; 5(10): 394-396
Published online Oct 26, 2013. doi: 10.4330/wjc.v5.i10.394
Figure 1
Figure 1 The Circle of Willis: The values of curvature (R and r).