1. Department of Environmental Exposure and Epidemiology, Norwegian Institute of Public Health, Oslo, Norway
2. Department of Non-Communicable Diseases, Norwegian Institute of Public Health, Oslo, Norway
3. Unger-Vetlesen Institute, Lovisenberg Diaconal Hospital, Oslo, Norway
4. Department of Biostatistics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
5. Department of Microbiology, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
6. Department of Microbiology, Tumor and Cell Biology, Karolinska Institute, Stockholm, Sweden
7. Center for Environmental Health, Public Health Foundation of India, Gurgaon, India