“…In 11 pedigrees (1, 5, 6, 21, 26, 28, 31, 38, this report) only siblings were reported as affected; in most of these reports parents were not examined. In three pedigrees, numerous first cousins were affected through their parents who were unaffected siblings (18,26). There were 22 publications of one or more sporadic cases, including our own.…”