1 Department of Microbiology, Immunology, and Transplantation and Department of Haematology, University Hospitals Leuven, 3000 Leuven, Belgium. Electronic address: johan.maertens@uzleuven.be.
2 Department of Infectious Disease (HAW), Merck & Co, Kenilworth, NJ, USA.
3 Department of Biostatistics and Research Decision Sciences, Merck & Co, Kenilworth, NJ, USA.
4 Department of Genetics and Pharmacogenomics, Merck & Co, Kenilworth, NJ, USA.