1. Department of Internal Medicine, Universite Catholique de Louvain (UCL), Saint-Luc University Hospital, Brussels, Belgium.
2. Department of International Health, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland.
3. Department of Otorhinolaryngology, Head and Neck Surgery, Universite Catholique de Louvain (UCL), Saint-Luc University Hospital, Brussels, Belgium.
4. Department of Pathology, Universite Catholique de Louvain (UCL), Saint-Luc University Hospital, Brussels, Belgium.