1. Institute of Analytical Chemistry , Slovak University of Technology in Bratislava , Bratislava , Slovakia
2. Department of Analytical Chemistry , Charles University in Prague , Prague , Czech Republic
3. Metrology Research Centre , National Research Council Canada , Ottawa , ON K1A 0R6 Canada
4. National Institute of Quality Control in Health/Oswaldo Cruz Foundation , Rio de Janeiro , Brazil
5. VU University , Amsterdam , The Netherlands
6. National School of Public Health at Oswaldo Cruz Foundation , Rio de Janeiro , Brazil
7. Department of Chemistry , Université de Montréal , Montréal , Canada