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- Published online November 14, 2013.
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- *Respiratory Research Unit, Bispebjerg University hospital, Copenhagen, Denmark
- #Copenhagen Fertility Center, Copenhagen, Denmark
- ¶The Danish twin registry, Institute for Health and Service Research, Odense, Denmark
- Elisabeth Juul Gade, Respiratory Research Unit, Bispebjerg University Hospital, Bispebjerg Bakke 23, DK-2400 Copenhagen NV, E-mail: Elisabeth_gade{at}yahoo.com