It needs to be crystal clear that using @override is not considered good style in Dart · Issue #14389 · dart-lang/sdk · GitHub
Experiment - Class annotation for disallowing use as a super-type, a.k.a "sealed classes" · Issue #11 · dart-lang/language · GitHub
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(PDF) To what degree is palliative care integrated in guidelines and pathways for adult cancer patients in Europe: A systematic literature review
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