1. Department of Medical Microbiology, Leiden University Medical Center, PO Box 9600, 2300RC, Leiden, The Netherlands
2. Center for Microbiome Analyses and Therapeutics, Leiden University Medical Center, PO Box 9600, 2300RC, Leiden, The Netherlands
3. Netherlands Donor Feces Bank, Leiden University Medical Center, PO Box 9600, 2300RC, Leiden, The Netherlands