Inclusion criteria: Lavage solution with oils, including liquid paraffin, coconut oil, olive oil, almond oil, or corn oil, that was given through the nasogastric tube or orally administered, in any dosage schedule, as monotherapy, or in combination with another pharmacotherapy such as KMnO4, MgSO4, NaHCO3, or activated charcoal, if these interventions were provided equally in the experimental and control groups.