@prefix skos: . @prefix isac: . isac:_inability_ skos:broader isac:important_limitation_ . skos:broader isac:important_limitation_ . isac:_datum_ skos:broader isac:important_limitation_ . isac:_however_ skos:broader isac:important_limitation_ . isac:_information_ skos:broader isac:important_limitation_ . isac:_patient_ skos:broader isac:important_limitation_ . isac:_requirement_ skos:broader isac:important_limitation_ . isac:_study_ skos:broader isac:important_limitation_ . isac:_therefore_ skos:broader isac:important_limitation_ . isac:_retrospective_ skos:broader isac:important_limitation_ . isac:_fact_ skos:broader isac:important_limitation_ . isac:_need_ skos:broader isac:important_limitation_ . isac:_speed_ skos:broader isac:important_limitation_ . skos:broader isac:important_limitation_ . isac:_difficulty_ skos:broader isac:important_limitation_ . isac:_attrition_ skos:broader isac:important_limitation_ . isac:_potential_ skos:broader isac:important_limitation_ . isac:retrospective_nature_ skos:broader isac:important_limitation_ . skos:broader isac:important_limitation_ .