The Computed Centrality Measures (IMAGE) University of Helsinki Caption Betweenness, for the considered host populations, computed based on their projection to the closest point in the road network. Credit Elina Numminen Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.