Diane Dennis BSc, PhD, FHEAHead of Physiotherapy Department Sir Charles Gairdner and Osborne Park Healthcare Group, Nedlands, 6009, Perth, Western Australia, Australia Peter Vernon van Heerden, MBBCh, MMed(Anaes), PhDDepartment of Anesthesiology, Critical Care and Pain MedicineHadassah Medical Center, Jerusalem, Israel Michael Ruppe, MDDivision of Critical Care, Department of PediatricsUniversity of Louisville, and Norton Children’s Medical Group, Louisville, KY, USA