aInfection Biology Laboratory, Department of Biomedicine

bDivision of Infectious Diseases and Hospital Epidemiology

cDepartment of Clinical Research, University Hospital of Basel, Basel, Switzerland

Correspondence to Nina Khanna, MD, Division of Infectious Diseases and Hospital Epidemiology and Department of Biomedicine, University Hospital of Basel, Basel, Switzerland. Tel: +41 61 328 73 25; e-mail: [email protected]

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