1. From the Department of Clinical Nutrition, University of Kuopio, Kuopio, Finland, Department of Applied Chemistry and Microbiology, University of Helsinki, Helsinki, Department of Pharmacy, Kuopio University Hospital, Kuopio, Department of Medicine, Division of Gastroenterology, University of Helsinki, Helsinki, Department of Medicine, Division of Internal Medicine, University of Helsinki, Helsinki, and Kuopia University Hospital, Kuopia, Finland.