About the Authors

Aslak Steinsbekk

aslak.steinsbekk@ntnu.no

Affiliation Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway

Marit By Rise

Affiliation Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway

Felicity Bishop

Affiliation Complementary and Integrated Medicine Research Unit, Primary Medical Care, University of Southampton, Southampton, United Kingdom

George Lewith

Affiliation Complementary and Integrated Medicine Research Unit, Primary Medical Care, University of Southampton, Southampton, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: AS. Wrote the paper: AS MBR FB GL.