1 Institute of Medical Chemistry, Biochemistry and Clinical Biochemistry, Faculty of Medicine, Comenius University, Sasinkova 2, 811 08, Bratislava, Slovak Republic. alena.viktorinova@fmed.uniba.sk.
2 Laboratory of Toxic and Essential Elements, Department of Environmental Medicine, Slovak Medical University, Bratislava, Slovak Republic.
3 Department of Pediatric Psychiatry, Faculty of Medicine, Comenius University, Bratislava, Slovak Republic.
4 Institute of Medical Chemistry, Biochemistry and Clinical Biochemistry, Faculty of Medicine, Comenius University, Sasinkova 2, 811 08, Bratislava, Slovak Republic.