Each transition did not merely accelerate an existing process; it changed the architecture of the system itself, redistributing risk, cost, and control in ways that redefined institutional roles. We ...

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Chagas cardiomyopathy, caused by chronic infection with Trypanosoma cruzi, is a leading cause of non-ischaemic heart failure in Latin America and is increasingly recognised worldwide due to migration.

1) before singular nouns that we have already mentioned with a/an: We saw an elephant. The elephant was standing under some trees. 2) before singular, plural or uncountable nouns when we say exactly ...