[1
]
Anaesthetics, Critical Care and Pain Medicine, University of Edinburgh, Edinburgh,
Scotland, UK. Electronic address: twalsh@staffmail.ed.ac.uk.
[2
]
Anaesthetics, Critical Care and Pain Medicine, University of Edinburgh, Edinburgh,
Scotland, UK; Edinburgh Napier University, Edinburgh, Scotland, UK.
[3
]
Edinburgh Clinical Trials Unit, University of Edinburgh, Edinburgh, Scotland, UK.
[4
]
Centre for Population Health Sciences, University of Edinburgh, Edinburgh, Scotland,
UK.
[5
]
Anaesthetics, Critical Care and Pain Medicine, University of Edinburgh, Edinburgh,
Scotland, UK.
[6
]
Edinburgh Napier University, Edinburgh, Scotland, UK; Edinburgh Health Services Research
Unit, Edinburgh, Scotland, UK.
[7
]
GE Healthcare Finland Oy, Kuortaneenkatu 2, 00510 Helsinki, Finland.
[8
]
Department of Anaesthetics, Ninewells Hospital, NHS Tayside, Scotland, UK.
[9
]
University Department of Anaesthetics, Glasgow University, Glasgow Royal Infirmary,
Glasgow, Scotland, UK.
[10
]
Department of Anaesthetics, Monklands Hospital, NHS Lanarkshire, Scotland, UK.
[11
]
Department of Anaesthetics, Victoria Hospital, Kirkcaldy, NHS Fife, Scotland, UK.
[12
]
Department of Anaesthetics, Victoria Infirmary, NHS GGC, Glasgow, Scotland, UK.
[13
]
Department of Anaesthetics, Dumfries and Galloway Royal Infirmary, NHS Dumfries and
Galloway, Scotland, UK.
[14
]
Department of Anaesthetics, Forth Valley Royal Hospital, NHS Forth Valley, Scotland,
UK.
[15
]
Centre for Population Health Sciences, University of Edinburgh, Edinburgh, Scotland,
UK; Edinburgh Health Services Research Unit, Edinburgh, Scotland, UK.