title: Dr. Malm et al. reply.
authors.affiliation: 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.
authors.forename: Heli
authors.initials: H
authors.lastname: Malm
authors.affiliation: 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.
authors.forename: Alan S
authors.initials: AS
authors.lastname: Brown
authors.affiliation: 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.
authors.forename: André
authors.initials: A
authors.lastname: Sourander