1. Elisabeth Arborelius, Department of Community medicine, Linköping University, S-581 85 Linköping, Sweden Department of Anthropology, Brown University, Providence, RI 02912, USA
2. Toomas Timpka, Department of Community medicine, Linköping University, S-581 85 Linköping, Sweden Department of Anthropology, Brown University, Providence, RI 02912, USA, Address for offprints: Toomas Timpha Dept of Community Medicine Linkoping University S-58185 Linkoping Sweden
3. James M. Nyce, Department of Community medicine, Linköping University, S-581 85 Linköping, Sweden Department of Anthropology, Brown University, Providence, RI 02912, USA