About the Authors

Caspar Chorus


Affiliation Department of Engineering Systems and Services, Delft University of Technology, Delft, The Netherlands

Ludo Waltman

Affiliation Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: CC LW. Data curation: LW. Formal analysis: CC LW. Investigation: CC LW. Methodology: CC LW. Resources: LW. Software: LW. Visualization: CC LW. Writing – original draft: CC. Writing – review & editing: LW.