About the Authors

Karina Lauenborg Møller

Kalm@si-folkesundhed.dk

Affiliation National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark

Lau Caspar Thygesen

Affiliation National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark

Jasper Schipperijn

Affiliation Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark

Steffen Loft

Affiliation Section of Environmental Health, Department of Public Health, University of Copenhagen, Copenhagen, Denmark

Jens Peter Bonde

Affiliation Department of Occupational and Environmental Medicine, Copenhagen University Hospital Bispebjerg, Copenhagen, Denmark

Sigurd Mikkelsen

Affiliation Department of Occupational and Environmental Medicine, Copenhagen University Hospital Bispebjerg, Copenhagen, Denmark

Charlotte Brauer

Affiliation Department of Occupational and Environmental Medicine, Copenhagen University Hospital Bispebjerg, Copenhagen, Denmark

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KLM LCT JS SL JPB SM CB. Performed the experiments: KLM. Analyzed the data: KLM LCT JS SL JPB SM CB. Contributed reagents/materials/analysis tools: KLM LCT JS SL JPB SM CB. Wrote the paper: KLM LCT JS SL JPB SM CB. The idea of the research was developed in collaboration between these authors: KLM LCT JS SL JPB SM CB. Wrote the first draft of the paper: KLM. Contributed to set-up the GPS units and run data through PALMS and ArcGis10: JS. Contributed to the data management and the merging of the GPS- and Nano Tracer data: LCT. Made figure 1 and wrote the section of data processing and a part of the instruments and measurements in the method section: JS. Contributed to the design, analyzing, critical discussion of data and revision of the manuscript: KLM LCT JS SL JPB SM CB. Has seen and approved the final version of the manuscript: KLM LCT JS SL JPB SM CB.