Before revision:  Also, we find that there exist in the respective networks, core-periphery structures (determined through centrality measures) that are composed of  similar set of countries -- a result that may be related through the `gravity model' of the country-level macroeconomic networks.
After revision:  Also, we find that there exist in the respective networks, core-periphery structures (determined through centrality measures) that are composed of the similar set of countries -- a result that may be related through the `gravity model' of the country-level macroeconomic networks.