1. Department of Biochemistry and Microbiology; Institute of Chemical Technology; Technická 3; CZ-166 28; Prague 6; Czech Republic
2. Royal Institute for Cultural Heritage (KIK/IRPA); Jubelpark 1; B-1000; Brussels; Belgium
3. Department of Archaeology; Ghent University; Sint-Pietersnieuwstraat 35; B-9000; Ghent; Belgium
4. Department of Analytical Chemistry; Ghent University; S-12, Krijgslaan 281; B-9000; Ghent; Belgium