1. From the Faculty of Medicine, Imperial College at Queen Charlotte’s and Chelsea Hospital (H.M., H.M.G.); Brompton Fetal Cardiology, Royal Brompton Hospital (H.M., M.M., H.J., H.M.G.); and Royal Brompton Hospital NHS Trust (M.R.), London, UK. Dr Mellander is now at the Department of Paediatric Cardiology, The Queen Silvia Children’s Hospital, Gothenburg, Sweden.