Inclusion Criteria:  ASA Physical Status Classification Grade 1-3 Patients who can provide written consent to participate in clinical trials Patients requiring the I-gel™ during surgery  Exclusion Criteria:  Outpatient surgery Patients who have the neurologic disease or cognitive impairment Patients who take antipsychotic drugs Body mass index > 35 kg/m2 Mouth opening < 2.5 cm Limited neck extension or cervical mobilization (Ex: Atlanto-axial subluxation, History of cervical spine surgery or head and neck surgery) Those with a recent sore throat Those with weak dentation Patients at risk of aspiration (Ex: Pregnancy, Gastroesophageal reflux disease or hiatus hernia)