Warning about Wiley's PDF rendering omitting special characters
Currently the Symbols and special characters section gives the impression that what you see is what you get. This is unfortunately misleading. For example the character ≠ will appear in the RevMan file normally just like any letter or number. However, when the protocol or review with this character in the text is published the character will not appear on the PDF at all. This is a technical problem and should be fixed as such. Before it is fixed people need to be aware of this and think of suitable workarounds.
Jani Ruotsalainen, ME/Cochrane Work
Agreed by Style Manual leads.
Information to be added temporarily, until resolved by publisher.
John Hilton commented
Thanks, Jani, this isn't really a matter of 'style' but agree that practical guidance useful within the Style Manual.