1. Department of Hygiene, Social and Environmental Medicine, Ruhr-University Bochum, Germany
2. Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, University Erlangen-Nuremberg, Germany
3. North Rhine-Westphalia State Agency for Nature, Environment and Consumer Protection, Recklinghausen, Germany
4. Ministry of Environment and Conservation, Agriculture and Consumer Protection, North Rhine–Westphalia, Düsseldorf, Germany
5. Public Health Department of the Hochsauerlandkreis, Meschede, Germany