List all discipline of the journals whose one of the discipline is Cerebral blood flow ?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/academicDiscipline> <http://dbpedia.org/resource/Cerebral_blood_flow> . ?x <http://dbpedia.org/ontology/academicDiscipline> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/AcademicJournal>}
Cerebral_blood_flow