title: Surgical ritual.
mesh_terms: D002562:Ceremonial Behavior; D006204:Hair Removal; D006801:Humans; D007441:Intubation, Gastrointestinal; D011015:Pneumonia, Aspiration / Q000517:prevention & control; D011182:Postoperative Care; D011300:Preoperative Care; D013242:Sterilization