1 Department of Internal Medicine, Section Infectious Diseases, Onze Lieve Vrouwe Gasthuis, 1091 AC Amsterdam, Netherlands. Electronic address: g.e.l.vandenberk@olvg.nl.
2 Infectious Diseases Department, Fondazione Policlinico San Matteo, Istituto di Ricovero e Cura a Carattere Scientifico, University of Pavia, Pavia, Italy.
3 Department for Clinical Immunology and Rheumatology, Hannover Medical School, Hannover, Germany.
4 Division of Infectious Diseases, Stellenbosch University, Faculty of Medicine and Health Sciences, Cape Town, South Africa.
5 Department of Internal Medicine, Infectious Diseases Section, University Medical Center Utrecht, University Utrecht, Utrecht, Netherlands.