Morbidity in a Danish National cohort of 472 IVF/ICSI twins, 1132 non-IVF/ICSI twins and 634 IVF/ICSI singletons: health-related and social implications for the children and their families. - Pinborg,A.; Loft,A.; Schmidt,L.; Andersen,A.N. (Human Reprod, 2003)