Affiliation: | 1. Cytogenetics Department, Guy's & St Thomas' NHS Foundation Trust, 5th Floor, Tower Wing, Great Maze Pond, London SE1 9RT, UK;2. Prenatal Genetic Diagnosis Unit, Genetic Institute, Sourasky Medical Center, Tel Aviv, Israel;3. Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, BCM225, Houston, TX 77030, USA |