. 2020 Aug;49(8):1411–1421. doi: 10.18502/ijph.v49i8.3863
Copyright© Iranian Public Health Association & Tehran University of Medical Sciences
This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fig. 1:
Flow diagram of including of relevant studies