. 2019 Feb 20;2019:3845462. doi: 10.1155/2019/3845462
Copyright © 2019 Amin Amini and Konstantinos Banitsas.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Vertical angle determination.