University of Chicago

University of Groningen, University Hospital Groningen, The Netherlands

Dublin Dental University Hospital, University of Dublin, Trinity College Dublin, Ireland

Michigan State University

National Institute for Public Health and the Environment, The Netherlands

Professor i klinisk mikrobiologi, Københavns Universitet

Professor, Chinese University of Hong Kong

Associate Professor of Microbiology, New York University School of Medicine

National University of Singapore

Dept. of Medicine, University of Pennsylvania