PubMed is free version of Medline (stands for Public Medline)
Using wildcards in Scopus
USING WILDCARDS IN SCOPUS
Wildcards are shortcut characters which can help to include spelling variations and derivatives of your key word without having to type each individually. Here are the ones you can use in Scopus, but be aware that this may vary for individual databases.
ASTERISK
Use before, within or after word or string to replace multiple characters (note: do not separate a * from a word with a hyphen as then * will be dropped: eg. *-attack will be searched as attack, but *attack will find heart-attack etc.)
e.g. computer* retrieves computer, computers, computerised, etc.
QUESTION MARK
Depending on database, use before, within or after word or string to replace zero or one character
e.g. colo?r retrieves color, colour
"
DOUBLE QUOTES
Use to find loose phrases
e.g TITLE-ABS-KEY( "heart attack") searches for documents where heart attack appear together in the title, abstract, or keywords, with or without a hyphen in between. Without the quotes this would search for heart and attack together or separately in the title, abstract or keywords.
{}
BRACES
To find documents that contain an exact phrase, enclose the phrase in braces.
e.g. {heart-attack} and {heart attack} will return different results because the dash is included.