An efficacy may pertain-to a (tax system).Logical formLearned from2 sentences. A challenge can be to an efficacy of a (tax system).Logical formLearned from2 sentences. An efficacy may pertain-to sacraments.Logical formLearned from2 sentences. Efficacy can be against cervical cancer.Logical formLearned from2 sentences. An efficacy of therapies may be established.Logical formLearned from2 sentences. Evidence can be on an efficacy.Logical formLearned from2 sentences. A measure can be constituted-of-or-filled-with (treatment efficacy).Logical formLearned from2 sentences. Therapy may demonstrate efficacy.Logical formLearned from2 sentences. Research may demonstrate an efficacy of antioxidants.Logical formLearned from2 sentences. Trophic factors may influence synaptic efficacy.Logical formLearned from2 sentences. A test of an efficacy of a method can be absent.Logical formLearned from2 sentences. Claims can be for an efficacy of communication.Logical formLearned from2 sentences. Literature can be on an efficacy of approaches.Logical formLearned from2 sentences. An experiment may test an efficacy of exchange.Logical formLearned from2 sentences. An (efficacy trial) may mean that something-is-the-case.Logical formLearned from2 sentences.