1. Department of Clinical ChemistryUniversity of Kuopio, and Center for Diagnostic BiotechnologyA. I. Virtanen InstituteSF‐70210KuopioFinland
2. The Institute for Human Gene TherapyThe Wistar InstitutePhiladelphiaPennsylvania19104‐4268USA
3. Department of Pathology and Laboratory MedicineChildren's Hospital of Los AngelesLos AngelesCalifornia90054‐0700USA
4. Department of BiochemistryUniversity of South AlabamaMobileAlabama36688USA