1. National Institute for Occupational Safety and Health Morgantown WV USA
2. School for Physiology, Nutrition and Consumer Sciences North‐West University Potchefstroom South Africa
3. Department of Dermatology, Environmental Medicine, Health Theory University of Osnabrueck Osnabrueck Germany
4. Bispebjerg Hospital University of Copenhagen Copenhagen Denmark
5. Department of Public Health College of Public Health China Medical University Taichung Taiwan
6. Occupational Dermatology Research and Education Centre Skin and Cancer Foundation Inc Carlton Vic. Australia
7. Environmental and Occupational Medicine University of Aberdeen Aberdeen Scotland
8. Dalla Lana School of Public Health University of Toronto and Department of Occupational and Environmental Health St. Michael's Hospital Toronto ON Canada