[1] Radboud Univ Nijmegen, Med Ctr, Dept Obstet & Gynecol, NL-6525 GA Nijmegen, Netherlands
[2] Radboud Univ Nijmegen, Med Ctr, Dept Epidemiol Biostat & Hlth Technol Assessment, NL-6525 GA Nijmegen, Netherlands
[3] TNO Qual Life, Leiden, Netherlands
[4] Univ Utrecht, Fac Social Sci, Dept Methodol & Stat, Utrecht, Netherlands
[5] Radboud Univ Nijmegen, Med Ctr, Dept Pediat, NL-6525 GA Nijmegen, Netherlands