Systematic review of benefits or harms of routine anaesthetist‐inserted throat packs in adults: practice recommendations for inserting and counting throat packs: An evidence‐based consensus statement by the Difficult Airway Society (DAS), the British Association of Oral and Maxillofacial Surgery (BAOMS) and the British Association of Otorhinolaryngology, Head and Neck Surgery (ENT‐UK). (10th January 2018)