About the Authors

Paul J. Krezanoski

Roles Conceptualization, Formal analysis, Funding acquisition, Methodology, Project administration, Supervision, Writing – original draft, Writing – review & editing

paul.krezanoski@ucsf.edu

Affiliations University of California San Francisco, San Francisco, CA, United States of America, Opportunity Solutions International, San Francisco, CA, United States of America

Joseph D. Krezanoski

Roles Conceptualization, Formal analysis, Investigation, Project administration, Writing – original draft, Writing – review & editing

Affiliations Opportunity Solutions International, San Francisco, CA, United States of America, Massachusetts General Hospital Institute of Health Professions, Boston, MA, United States of America

Nkosinathi Nxumalo

Roles Methodology, Supervision, Writing – review & editing

Affiliation ICAP at Columbia University, Mbabane, eSwatini

Rose Gabert

Roles Formal analysis, Writing – review & editing

Affiliations Opportunity Solutions International, San Francisco, CA, United States of America, University of Washington, Seattle, WA, United States of America

Alison B. Comfort

Roles Conceptualization, Formal analysis, Funding acquisition, Methodology, Writing – review & editing

Affiliations University of California San Francisco, San Francisco, CA, United States of America, Opportunity Solutions International, San Francisco, CA, United States of America

Phinda Khumalo

Roles Investigation, Methodology, Project administration, Writing – review & editing

Affiliation National Yang Ming University, Taipei, Taiwan

Kidwell Matshotyana

Roles Conceptualization, Methodology, Project administration, Supervision, Writing – review & editing

Affiliation Eastern Cape Department of Health, Bhisho, South Africa

Competing Interests

PJK and ABC are Founding Directors and members of the Board of Opportunity Solutions International (unpaid). JDK is an unpaid employee of Opportunity Solutions International and the inventor of SAFEcount. Opportunity Solutions International and JDK are co-owners of intellectual property related to a pending patent for the SAFEcount device (US Patent Application No. 16/208,525). This does not alter our adherence to PLOS ONE policies on sharing data and materials.