1. Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, 1870 Denmark
2. Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093
3. Merck & Co., Inc., South San Francisco, CA 94080
4. Host-Microbe Interactomics, Animal Sciences Group, Wageningen University, Wageningen, The Netherlands