Reproductive Medicine Centre;
Skane University Hospital;
Malmo 20502;
Sweden;
Division of Occupational and Environmental Medicine;
Lund University;
Lund 22185;
Sweden;
Department of Occupational Medicine;
Copenhagen University;
Bispebjerg Hospital;
Copenhagen NV2400;
Denmark;
Department of Clinical Sctences;
Malmo;
Lund University;
Malmo 20502;
Sweden;