作者单位:SOFT Support Org Tris 18 13 & Related Disorders, Rochester, NY USA[1]Northwestern Univ, Evanston, IL 60208 USA[2]Childrens Hosp Colorado, Aurora, CO USA[3]Obstetrix Med Grp, 2055 High St,Suite 230, Denver, CO 80205 USA[4]Univ Colorado, Sch Med, Boulder, CO 80309 USA[5]