The purpose of this research study is to collect different types of samples (such as stool, swabs, urine) to form a biorepository. This repository will provide valuable samples from people with and without IBD so that investigators can learn more about the cause of IBD, and different therapies that could be used to treat it. These samples will be used for future gastrointestinal research. Because technology and scientific understanding may advance quickly, it is not yet known what specific studies the samples may be used for.

The purpose of this study is to characterize the microbiome in children with Crohns disease who have perianal fistula and to compare it to other children with Crohns disease who do not have perianal disease. Studying the role of the microbiome in perianal fistula may help us to develop new therapies.

The Childrens Hospital of Philadelphia is seekinghealthy adolescents between the ages of 12-13, who are currently in the 7^thgrade,to participate in the Sleep and Growth Study 2. The purpose of this research is to learn more about the changes in sleep and body size in adolescents as they transition from middle to high school. Participants will be asked to visit CHOP so that we can measure their bone density. Following this visit, participants will wear a sleep tracker over a 2-week period and speak to a team member by phone on three occasions about the types of food eaten in the previous 24 hours. If you and your child agree to participate, the study will involve 3 visits over approximately 2 years. All participants are compensated for their time and effort.For more information and study details, please call 215-590-2383, ext. 1, or emails_grow@chop.edu.