Benoit Nemery1, Patrick de Marie Katoto2. 1. Centre for Environment and Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium. Electronic address: ben.nemery@kuleuven.be. 2. Centre for Environment and Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium; Department of Internal Medicine, Hôpital Provincial de Bukavu, Catholic University of Bukavu, Bukavu, DR Congo.