1. Saija Laitinen, Division of Nutrition, Department of Applied Chemistry and Microbiology, University of Helsinki, Correspondence and requests for off-prints: S. Laitinen, Division of Nutrition, Department of Applied Chemistry and Microbiology, P.O. Box 27, FIN-00014 University of Helsinki, Finland
2. Leena Räsänen, Division of Nutrition, Department of Applied Chemistry and Microbiology, University of Helsinki
3. Jorma Viikari, Department of Medicine, University of Turku
4. Hans K. Åkerblom, the Children's Hospital, II Department of Pediatrics, University of Helsinki