**2.2. Temporal and geospatial analysis**

The data were processed for temporal and geospatial analysis by Sci2 Tool (Sci2 Team). We generated temporal visualization of burst detection analysis of ISI keywords used in the papers. The geolocation of author collaboration was realized using Citespace (http://cluster. cis.drexel.edu/~cchen/citespace/) and Google Earth (https://www.google.it/intl/it/earth/).
