1. Department of Laboratory Medicine; Catholic University of Bukavu; Bukavu Democratic Republic of the Congo
2. Department of Internal Medicine; Catholic University of Bukavu; Bukavu Democratic Republic of the Congo
3. Department of Ophthalmology; Sint-Elisabeth Ziekenhuis; Zottegem Belgium
4. Department of Nephrology; Ghent University Hospital; Gent Belgium
5. Department of Clinical Chemistry; Ghent University Hospital; Gent Belgium
6. Department of Endocrinology; Ghent University Hospital; Gent Belgium