1. Department of Ophthalmology, Cliniques Universitaires Saint-Luc, UCLouvain, Bruxelles, Belgium
2. Department of Ophthalmology, CHU UCL NAMUR, UCLouvain, Yvoir, Belgium
3. National Reference Center for Tropical Diseases, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany
4. St Raphael Ophthalmological Center, Ophthalmological Ambulance, Mbuji Mayi, Democratic Republic of Congo