Porpora Maria G, D'Elia Claudia, Bellavia Marina, Pultrone Dora C, Cosmi Ermelando V
Institute of Gynecological Sciences, Perinatology ard Child Health, University of Rome La Sapieriza, Rome, Italy.
Acta Obstet Gynecol Scand. 2003 Nov;82(11):1058-9. doi: 10.1034/j.1600-0412.2003.00069.x.