1 Centre for Research into Circulating Fetal Nucleic Acids Li Ka Shing Institute of Health Sciences Department of Chemical Pathology and.
2 Department of Obstetrics and Gynaecology The Chinese University of Hong Kong Shatin, New Territories Hong Kong SAR, China.
3 Centre for Research into Circulating Fetal Nucleic Acids Li Ka Shing Institute of Health Sciences Department of Chemical Pathology and loym@cuhk.edu.hk.