1. Department of Laboratory Medicine, Section of Occupational and Environmental Medicine, Lund University, Lund, Sweden
2. Institute of Environmental Medicine, Section for Metals and Health, Karolinska Institutet, Stockholm, Sweden
3. University Medical Centre Ljubljana, Clinical Institute of Clinical Chemistry and Biochemistry, Ljubljana, Slovenia
4. National Food Administration, Toxicology Division, Uppsala, Sweden
5. International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
6. San Antonio de Los Cobres Hospital, San Antonio de Los Cobres, Argentina