[1] Catholic Univ Louvain, Inst Rech Expt & Clin, Pole Rech Physiopathol Reprod, Brussels, Belgium
[2] Univ Fed Goias, Dept Histol Embryol & Cell Biol, Inst Biol Sci, Goias, Brazil
[3] Karolinska Inst Intervent & Technol, Div Obstet & Gynecol, Dept Clin Sci, S-14186 Stockholm, Sweden
[4] Univ Illinois, Dept Comparat Biosci, Urbana, IL 61802 USA