[1] Vrije Univ Amsterdam Med Ctr, EMGO Inst, Dept Publ & Occupat Hlth, Amsterdam, Netherlands
[2] Vrije Univ Amsterdam Med Ctr, Dept Internal Med, Amsterdam, Netherlands
[3] Vrije Univ Amsterdam Med Ctr, Dept Obstet, Amsterdam, Netherlands
[4] MetroHealth, Ctr Reprod Hlth, Cleveland, OH USA