1. Intravacc, Bilthoven 3720 AL, The Netherlands
2. Division
of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden 2300 RA, The Netherlands
3. Centre
for Infectious Disease Control, National Institute for Public Health and the Environment (RIVM), Bilthoven 3720 BA, The Netherlands
4. Centre
for Health Protection (GZB), National Institute for Public Health and the Environment (RIVM), Bilthoven 3720 BA, The Netherlands