1 Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, USA; Global Tracheostomy Collaborative, Raleigh, NC, USA.
2 Acute Intensive Care Unit, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK. Electronic address: [email protected].
3 Acute Intensive Care Unit, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK; Manchester Academic Critical Care, Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK.