1. Department of GastroenterologyVU University Medical CentreAmsterdamThe Netherlands
2. Department of Nutrition and DieteticsVU University Medical CentreAmsterdamThe Netherlands
3. Department of Epidemiology and BiostatisticsVU University Medical CentreAmsterdamThe Netherlands
4. Department of PathologyVU University Medical CentreAmsterdamThe Netherlands
5. Department of HaematologyVU University Medical CentreAmsterdamThe Netherlands