Ohlinger Ralf, Kühl Anja, Schwesinger Günther, Bock Petra, Lorenz Gerd, Köhler Günter
Department of Obstetrics and Gynecology, Ernst-Moritz-Arndt-University, Greifswald, Germany.
Acta Obstet Gynecol Scand. 2004 Jul;83(7):685-6. doi: 10.1111/j.0001-6349.2004.0226b.x.