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. 2020 Jun;74(3):224–227. doi: 10.5455/medarh.2020.74.224-227

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© 2020 Nguyen Minh Duc, Hoang Duc Ha, Pham Minh Thong

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3.