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Medical testing for this study will be done at the Washington University School of Medicine General Clinical Research Center (GCRC). This federally-supported research resource, now operating for more than 30 years, is made of an Adult Unit and a Pediatric Unit which are both capable of providing care for children. Making both units available gives us greater flexibility in scheduling a convenient time for you and your child. Both units are specialized areas available only to research participants. The Adult Unit is located on the 4th and 5th floors of Barnard Hospital. The Pediatric Unit is located on the 11th floor of St. Louis Children's Hospital. Washington University School of Medicine, including the pediatric, psychiatric, and endocrinology contributions to this project, is a consistent leader in National Institutes of Health (NIH) funding. Washington University School of Medicine ranks 4th nationally in National Institutes of Health grant funding.

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