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[\'Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland; Federal Office of Public Health, Liebefeld, Switzerland.\', \'Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland.\', \'Federal Office of Public Health, Liebefeld, Switzerland.\', \'Department of Environmental Systems Science, ETH Zürich, Zurich, Switzerland.\', \'Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland; Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK; Centre for Infectious Disease Epidemiology and Research, University of Cape Town, Cape Town, South Africa. Electronic address: matthias.egger@ispm.unibe.ch.\']
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