About the Authors

Randall S Stafford, Veronica Monti, Jun Ma
Program on Prevention Outcomes and Practices, Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, California, United States of America

Corresponding Author

rstafford@stanford.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

RSS obtained study funding. RSS and JM designed the study. RSS, VM, and JM analyzed the data and contributed to writing the paper.