def display_item(project, subject=None, session=None):
    """
    Method to display the tree

    :param project: project ID on XNAT
    :param subject: subject label on XNAT
    :param session: session label on XNAT
    :return: None
    """
    print('Project: %s' % project)
    if subject:
        print('  +Subject: %s' % subject)
        if session:
            print('    *Session: %s' % session)
