[1] Univ South Dakota, Sanford Sch Med, Dept Obstet & Gynecol, Sioux Falls, SD 57105 USA
[2] Sanford USD Med Ctr, Sanford Childrens Specialty Clin, Sioux Falls, SD USA
[3] Augustana Univ, Dept Genet, Sioux Falls, SD USA
[4] Sanford USD Med Ctr, Dept Obstet & Gynecol, Sioux Falls, SD USA
[5] Univ South Dakota, Sanford Sch Med, Dept Pediat, Sioux Falls, SD USA
[6] Sanford Res, Environm Exposures Hlth & Dis Grp, Sioux Falls, SD USA