About the Authors

Sharon L. McDonnell

Roles Formal analysis, Software, Visualization, Writing – original draft, Writing – review & editing

Affiliation GrassrootsHealth, Encinitas, California, United States of America

Keith A. Baggerly

Roles Formal analysis, Software, Visualization, Writing – review & editing

Affiliation Deptartment of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America

Carole A. Baggerly

Roles Conceptualization, Funding acquisition, Methodology, Supervision, Writing – review & editing

Affiliation GrassrootsHealth, Encinitas, California, United States of America

Jennifer L. Aliano

Roles Project administration

Affiliation GrassrootsHealth, Encinitas, California, United States of America

Christine B. French

Roles Writing – review & editing

christine@grassrootshealth.org

Affiliation GrassrootsHealth, Encinitas, California, United States of America

Leo L. Baggerly

Roles Formal analysis

Affiliation GrassrootsHealth, Encinitas, California, United States of America

Myla D. Ebeling

Roles Data curation

Affiliation Medical University of South Carolina Children’s Hospital, Charleston, South Carolina, United States of America

Charles S. Rittenberg

Roles Validation

Affiliation Medical University of South Carolina Children’s Hospital, Charleston, South Carolina, United States of America

Christopher G. Goodier

Roles Investigation, Validation

Affiliation Medical University of South Carolina Children’s Hospital, Charleston, South Carolina, United States of America

Julio F. Mateus Niño

Roles Investigation, Validation

Affiliation Medical University of South Carolina Children’s Hospital, Charleston, South Carolina, United States of America

Rebecca J. Wineland

Roles Investigation, Validation

Affiliation Medical University of South Carolina Children’s Hospital, Charleston, South Carolina, United States of America

Roger B. Newman

Roles Conceptualization, Supervision, Validation, Writing – review & editing

Affiliation Medical University of South Carolina Children’s Hospital, Charleston, South Carolina, United States of America

Bruce W. Hollis

Roles Conceptualization

Affiliation Medical University of South Carolina Children’s Hospital, Charleston, South Carolina, United States of America

Carol L. Wagner

Roles Conceptualization, Funding acquisition, Writing – review & editing

Affiliation Medical University of South Carolina Children’s Hospital, Charleston, South Carolina, United States of America

Competing Interests

Bio-Tech Pharmacal was a commercial source of resources (vitamin D supplements). It did not have any relationship with any of the authors with regard to employment, patents, or products marketed. Representatives of this source did not review the manuscript or play any role in design, analysis, or writing of the manuscript and had no control over any decision to publish it. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.