Overall MRI scanning is very safe and has no known major risks. Because the scanner uses strong magnets, anyone with metal objects in their bodies can't be scanned, as this could be dangerous. We will make sure that no one with metal objects in their bodies is included in the study. There can be some psychological risks involved in taking tests and answering questions, but these are usually mild and can be managed. There is always a risk that important confidential information will be made public and that this could have consequences. We will do everything possible to maintain confidentiality. Nearly all of the information will only be identified using a code number and not by the name of the person, and all of it will be kept securely.