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* indicates a figure with slightly different fieldwork dates from the rest of the row. Wording used: BMG: satisfied/dissatisfied, Find Out Now: well/badly, Focaldata: favourable/unfavourable, ...

Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

Definitions of hypoxaemia, hypoxia, type 1 respiratory failure and hyperoxaemia Definition of hypercapnia and type 2 respiratory failure Definition of acidosis (respiratory acidosis and metabolic ...