1. Institute of Nutrition & Food Safety, University of Barcelona, Barcelona, Spain
2. Department of Microbiology, School of Biology, University of Barcelona, Barcelona, Spain
3. Enteric Virus Laboratory, School of Biology, University of Barcelona, Barcelona, Spain; Department of Microbiology, University of Barcelona, Diagonal 645, 08028 Barcelona, Spain.
4. Department of Cellular Biology, School of Biology, University of Barcelona, Barcelona, Spain