Concentrations of 15 Trace Elements in Some Selected Adult Human Tissues and Body Fluids of Clinical Interest from Several Countries: Results from a Pilot Study for the Establishment of Reference Values. ZENTRAL BIBLIOTHEK der KERNFORSCHUNGSANLAGE JÜLİCH GmbH Institute of Medicine Julich Nuclear Research Research Center, D- 517 Juelich, Berichte der Kernforschungsanlage Jülich (Jülich-Nr.1974), Federal Republic of Germany,