Tullio Ghi1, Tiziana Frusca2, Christoph C Lees3. 1. University of Parma, Parma, Italy. Electronic address: tullioghi@yahoo.com. 2. University of Parma, Parma, Italy. 3. Department of Cancer and Surgery, Imperial College London, Centre for Fetal Care, Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare National Health Service Trust, London, UK.