Johns Hopkins University School of Medicine needs children (9 to 11 years old) to participate in a research study. Up to $345 compensation plus parking costs. The study involves MRI scans, one blood draw, two urine collections, body composition measurements (height, weight, waist, body composition and energy expenditure), questionnaires, buffet meals, games, and prizes. It lasts approximately 24 months with five study visits spread out during this time. Call 410-955-5099 or email firstname.lastname@example.org.