1. Mehiläinen Airport Health Centre, Vantaa & Finnish Institute of Occupational Health, Lappeenranta, Lentäjäntie 1 E, PO box 01530 Vantaa, Finland
2. Department of Medicine, Division of Internal Medicine, University of Helsinki, Helsinki, Finland
3. Institute of Public Health & Clinical Nutrition, Department of Clinical Nutrition, University of Eastern Finland, Kuopio, PO box 700, 00029 HUS, Finland