[1] Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Program Reprod & Adult Endocrinol, NIH, Bethesda, MD USA
[2] Carolinas Med Ctr, Dept Obstet & Gynecol, Charlotte, NC 28203 USA
[3] Abington Mem Hosp, Dept Obstet & Gynecol, Abington, PA 19001 USA
[4] Shady Grove Fertil Reprod Sci Ctr, Rockville, MD USA