About the Authors

Peter Vestergaard

p-vest@post4.tele.dk

Affiliation The Osteoporosis Clinic, Aarhus University Hospital, Aarhus, Denmark

Ole-Gunnar Støen

Affiliation Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway

Jon E. Swenson

Affiliations Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway, Norwegian Institute for Nature Research, Trondheim, Norway

Leif Mosekilde

Affiliation Department of Endocrinology and Internal Medicine, Aarhus University Hospital THG, Aarhus, Denmark

Lene Heickendorff

Affiliation Department of Clinical Biochemistry, Aarhus University Hospital, Aarhus, Denmark

Ole Fröbert

Affiliation Department of Cardiology, Örebro University Hospital, Örebro, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Performed the experiments: O-GS JES OF LH. Analyzed the data: PV. Contributed reagents/materials/analysis tools: LH. Wrote the paper: PV O-GS JES LM LH OF. Designed the Ursus arctos study: O-GS JES OF. Designed the vitamin D and bone turnover substudy: PV LM LH.