June 2008,
The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians,
Francisco Ramón Pampín Huerta, and
María Pilar Madruga Garrido, and
Alexandra Ceniceros Barros, and
Ángel Martínez Muñiz