1. Department of Companion Animal Clinical Sciences, Faculty of Veterinary Medicine and Biosciences; Norwegian University of Life Sciences; Oslo Norway
2. Centre for Epidemiology and Biostatistics, Faculty of Veterinary Medicine and Biosciences; Norwegian University of Life Sciences; Oslo Norway
3. Department of Food Safety and Infection Biology, Faculty of Veterinary Medicine and Biosciences; Norwegian University of Life Sciences; Oslo Norway
4. Department of Chemical and Biological Work Environment; National Institute of Occupational Health; Oslo Norway
5. Department of Surgery and Cancer, Hammersmith Hospital Campus; Imperial College London; London United Kingdom