Text: We would need to assure ourselves, however, that case studies whose results we are going to use have adopted the same procedures for ensuring impartiality.
Entailment: Whether or not case studies whose results we are going to use have adopted the same procedures for ensuring impartiality, is something we need assurance for.
Contradiction: Whether or not case studies whose results we are going to use have adopted the same procedures for ensuring impartiality, is something we can neglect.