1 Department of Prenatal Genetic Diagnosis and Fetal Therapy, Ospedale Microcitemico, Via E. Jenner n/n, 09121 Cagliari, Italy. Electronic address: prenatalmonni@tiscali.it.
2 Department of Prenatal Genetic Diagnosis and Fetal Therapy, Ospedale Microcitemico, Cagliari, Italy.