Department of Occupational and Environmental Medicine;
Copenhagen University Hospital Bispebjerg;
Copenhagen NV DK-2400;
Denmark;
Reproductive Medicine Centre;
Sk~ne University Hospital Malm6;
Lund University;
Malm6 SE-20502;
Sweden;
Division of Occupational and Environmental Medicine;
Department of Laboratory Medicine;
Lund University;
Lund SE-22185;
Sweden;
Department of Occupational Medicine;
Aarhus University Hospital;
Aarhus DK-8000;
Denmark;