1WHO Collaborating Centre for Metabolic Bone Diseases, University of Sheffield Medical School, Beech Hill Road, Sheffield S10 2RX, UK
2Consulting Statistician, Gothenberg, Sweden
3Department of Orthopaedics, Malmo General Hospital, S-214 01 Malmo, Sweden
4Institute for Public Health, Erasmus Medical Center, Rotterdam, The Netherlands
5Department of Economics, Stockholm School of Economics, Stockholm, Sweden
6Eli Lilly & Company, Lilly Corporate Center, Indianapolis, IN 46285, USA