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The authors have contributed equally much to the presentation. In alphabetical order:

Trude M. Arnesen, MD, MPH. PhD student, National Institute of Public Health, Pb 4404 Nydalen, 0403 Oslo, Norway.

E-mail: trude.arnesen@folkehelsa.no

Ole Frithjof Norheim, MD, Ph.D. Associate professor, Department of Public Health and Primary Care, University of Bergen, Norway.

E-mail: ole.norheim@isf.uib.no