1. J.-J. Schott and J. G. Seidman, Department of Genetics and Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA. D. W. Benson, C. T. Basson, C. E. Seidman, Cardiovascular Division and Howard Hughes Medical Institute, Brigham and Women's Hospital, Boston, MA 02115, USA. W. Pease, Harrisburg Hospital, Harrisburg, PA 17104, USA. G. M. Silberbach, Division of Pediatric Cardiology, Oregon Health Science University, Portland, OR 97201, USA. J. P. Moak, Division of Pediatric...