1. Preventive Medicine and Public Health Department, University of Navarra, Pamplona, Spain
2. IdiSNA, Navarra Institute for Health Research, Pamplona, Spain
3. Institute for Culture and Society (ICS), Education of Affectivity and Human Sexuality, University of Navarra, Pamplona Spain
4. CEFA-Monkole, Kinshasa, Democratic Republic of the Congo
5. Department of Family Medicine and Primary Health Care, UPC – Protestant University in Congo, Kinshasa, Democratic Republic of the Congo
6. CIBER Fisiopatología de la Obesidad y Nutrición (CIBER obn), Spanish Government (ISCIII), Madrid, Spain
7. School of Education and Psychology, University of Navarra, Pamplona, Spain
8. Monkole Hospital, Kinshasa, Democratic Republic of the Congo
9. Department of Ophthalmology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain