作者单位:Division of Genetics and Molecular Medicine, King's College London, School of Medicine at Guy's[1]Guy's and St Thomas Centre for PGD, Guy's and St. Thomas Hospital NHS Foundation Trust, London[2]Fondazione IRCCS Ca Granda Ospedale Maggiore Policlinico, Milan, Italy[3]Clinica Ostetrica e Ginecologica, Istituto Luigi Mangiagalli, Università Statale di Milano, Milan[4]