1. ETH ZürichPhysical Chemistry Vladimir-Prelog Weg 2 8093 Zürich Switzerland
2. Institut de Biologie et Chimie des ProteinesMMSBLabex EcofectUMR 5086 CNRSUniversité de Lyon 7 passage du Vercors 69367 Lyon France
3. Department of Infectious DiseasesMolecular VirologyHeidelberg University Im Neuenheimer Feld 345 69120 Heidelberg Germany
4. Division of Virus-Associated Carcinogenesis (Germany)Cancer Research Center (DKFZ) Im Neuenheimer Feld 242 69120 Heidelberg Germany