[1] Karolinska Inst, Dept Womens & Childrens Hlth, Stockholm, Sweden
[2] Univ Helsinki, Childrens Hosp, Div Haematol Oncol & Stem Cell Transplantat, Helsinki Univ Cent Hosp, Helsinki, Finland
[3] Karolinska Inst, NORDFERTIL Res Lab Stockholm, Childhood Canc Res Unit, Dept Womens & Childrens Hlth, Stockholm, Sweden
[4] Univ Hosp Karolinska Inst, Stockholm, Sweden
[5] Uppsala Univ, Dept Publ Hlth & Caring Sci, Uppsala, Sweden
[6] Uppsala Univ, Ctr Clin Res Sormland, Eskilstuna, Sweden
[7] Uppsala Univ, Dept Womens & Childrens Hlth, Uppsala, Sweden
[8] Univ Turku, Dept Pediat & Adolescent Med, Turku Univ Hosp, FICANWEST, Turku, Finland