1 Institute of Infection, Immunity and Inflammation, 120 Glasgow Biomedical Research Centre, University of Glasgow, Glasgow, G12 8TA, Scotland, United Kingdom. Electronic address: a.raponi.1@research.gla.ac.uk.
2 Institute of Infection, Immunity and Inflammation, 120 Glasgow Biomedical Research Centre, University of Glasgow, Glasgow, G12 8TA, Scotland, United Kingdom.
3 GlaxoSmithKline Biologicals SA, Technical and Research Development- Drug Product, Siena, Italy.