Upsala J Med Sci 95: 309, 1990 Acknowledgement The project group for the NORDKEM-project 5/89 wants to express its sincere gratitude to the Board of NORDKEM, not only for granting the necessary economical resources for the project but also for taking active part in planning the pro- ject and thus stressing the formulation of the objectives of the project. The project group wants to express its thanks to Mrs Gunilla Stromstedt, Department of Clinical Chemistry, University of Uppsala for secreterial help and for practical organization of the Seminar at Friibergh's herrgdrd, Bro on April 23 - 2 4 1990. It is a pleasure also to acknowledge Mrs Anette Marcusson, Department of Clinical Chemistry, University Hospital, Upp- sala, who with efficiency and accuracy prepared the manu- scripts for printing and Mrs Sinikka Savolainen who delt with the project at the NORDKEM office in Helsinki. 309