1. D. Van Renterghem, R. Cornelis, and R. Vanholder,J. Trace Elem. Electrolytes Health Dis 6, 169–174 (1992).
2. P. Padovese, M. Gallieni, D. Brancaccio, R. Pietra, S. Fortaner, E. Sabbioni, C. Minoia, K. Markakis, and A. Berlin,Nephron 61, 442–448 (1992).
3. A. Taylor, R. J. Briggs, and C. Cevik,Clin. Chem. 40, 1517–1521 (1994).
4. D. Van Renterghem, R. Cornelis, L. Mees and R. Vanholder,J. Trace Elem. Electrolytes Health Dis. 6, 105–109 (1992).
5. J. Versieck and R. Cornelis,Trace Elements in Human Plasma or Serum, CRC Press, Boca Rayon, FL pp. 176–187 (1989).