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Johan Van der Heyden is a senior researcher at Sciensano since June 1996, leading various national projects focused on public health, including the BELCOHORT+ and SalivaHIS projects, as well as significant contributions to COVID-19 health surveys and mortality studies. Prior to this role, Johan served as a District Medical Officer at the Ministry of Health in Zimbabwe from 1991 to 1995, overseeing clinical services and health district management, and coordinated a Water and Sanitation Project. Earlier experience includes serving as a medical doctor with Médecins sans Frontières from 1989 to 1990, managing health services and coordinating relief programs. Johan holds a Doctorate in Health Sciences from Ghent University, a Master's degree in Public Health Methodology from Université libre de Bruxelles, and a Medical Doctor degree from Ghent University.