[1] Princess Maxima Ctr Pediat Oncol, POB 85090, NL-3508 AB Utrecht, Netherlands
[2] Univ Amsterdam, Amsterdam UMC, Dept Pediat, Amsterdam, Netherlands
[3] Amsterdam UMC Locat Univ Amsterdam, Dept Obstet & Gynecol, Amsterdam, Netherlands
[4] Amsterdam Reprod & Dev, Amsterdam, Netherlands
[5] Univ Groningen, Univ Med Ctr Groningen, Dept Pediat Oncol, Groningen, Netherlands
[6] Radboud Univ Nijmegen Med Ctr, Nijmegen, Netherlands
[7] Erasmus MC Sophia Childrens Hosp, Erasmus Med Ctr, Rotterdam, Netherlands
[8] Carl von Ossietzky Univ Oldenburg, Dept Hlth Serv Res, Oldenburg, Germany
[9] Leiden Univ Med Ctr, Leiden, Netherlands
[10] Willem Alexander Childrens Hosp, Leiden, Netherlands