[1] Vrije Univ Amsterdam, Med Ctr, Dept Human Genet, Amsterdam, Netherlands
[2] Natl Inst Publ Hlth & Environm, Ctr Hlth Protect, Bilthoven, Netherlands
[3] UMC Utrecht, Dept Genet, Utrecht, Netherlands
[4] UMC Utrecht, Ctr Educ & Training, Utrecht, Netherlands
[5] UMC Utrecht, Ctr Mol Med, Utrecht, Netherlands