Description of the change: Heading 'Numbers with five or more digits' changed to 'Numbers with four or more digits' to fit examples.
Changed 'h' to 'hours' in correct example of ranges of numbers.
Description of the change: Adjusted 'Cochrane Review' to 'Cochrane review'.
Adjusted 'RevMan Web' to 'RevMan'.
Text updated for focused review format.
Table deleted and new figure for heading levels added.
Link added to Abbreviations
Typo corrected
Text amended to match Abbreviations section