1. Department of Clinical Biochemistry; Herlev and Gentofte Hospital; Hellerup Denmark
2. Department of Obstetrics and Gynecology; Aarhus University Hospital; Skejby Denmark
3. Department of Clinical Biochemistry; Copenhagen University Hospital Holbaek; Holbaek Denmark
4. Division of Occupational and Environmental Medicine; Institute of Laboratory Medicine; Lund University; Lund Sweden