Authors' reply: Effect of ethnicity on live birth rates after in vitro fertilisation or intracytoplasmic sperm injection treatment: possible explanations and further observations
1 Nottingham University Research and Treatment Unit in Reproduction (NURTURE), Division of Obstetrics and Gynaecology, Faculty of Medicine & Health Sciences, University of Nottingham, Nottingham, UK; Derby Fertility Unit, Royal Derby Hospital, Derby, UK.