1. Department of Growth and Reproduction (A.-M.A., T.K.J., A.J., J.H.P., N.E.S.), Copenhagen University Hospital, Copenhagen DK-2100, Denmark
2. Department of Environmental Medicine (T.K.J.), University of Southern Denmark, Odense DK-5230, Denmark
3. Department of Biostatistics (J.H.P.), University of Copenhagen, DK-2400 Copenhagen, Denmark
4. Research Centre for Prevention and Health (T.J.), Glostrup University Hospital, Glostrup DK-2600, Denmark