. 2011 Dec 20;6(4):207–216. doi: 10.5114/wiitm.2011.26254
Copyright © 2011 Sekcja Wideochirurgii TChP
This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial 3.0 Unported License, permitting all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 3.
Distribution of patients by the number of co-morbidities