About the Authors
- Erica B. Oberg, Ryan Bradley
- School of Naturopathic Medicine, Bastyr University, Kenmore, Washington, United States of America
- Clarissa Hsu, Karen J. Sherman, Sheryl Catz, Daniel C. Cherkin
- Group Health Research Institute, Seattle, Washington, United States of America
- Carlo Calabrese
- Naturopathic Physicians Research Institute, Portland, Oregon, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: EO RB DC CH KS CC SC. Performed the experiments: EO DC CH. Analyzed the data: EO DC CH KS RB. Wrote the paper: EO RB DC. Reviewed and edited the manuscript: EO RB CH KS SC CC DC.