1 Teratology Information Service, Helsinki University Hospital, and Helsinki University, Helsinki, Finland; Columbia University College of Physicians and Surgeons, New York; University of Turku, Turku, Finland. Electronic address: heli.malm@hus.fi.
2 Teratology Information Service, Helsinki University Hospital, and Helsinki University, Helsinki, Finland; Columbia University College of Physicians and Surgeons, New York; University of Turku, Turku, Finland.