About the Authors

Tony H. Grubesic

Roles Conceptualization, Data curation, Formal analysis, Methodology, Project administration, Visualization, Writing – original draft, Writing – review & editing

grubesic@utexas.edu

Affiliation Geoinformatics & Policy Analytics Laboratory, School of Information, University of Texas at Austin, Austin, TX, United States of America

Kelly M. Durbin

Roles Conceptualization, Data curation, Formal analysis, Writing – original draft, Writing – review & editing

Affiliation Childbirth International, Singapore, Singapore

Competing Interests

Kelly M. Durbin is employed by Childbirth International, but this commercial affiliation does not alter our adherence to PLOS ONE policies on sharing data and materials.