Role of informal healthcare providers in tuberculosis care in low- and middle-income countries: A systematic scoping review.

PLoS One · 2021 · PMC8412253 · PMID 34473752

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an increasing trendno p-value reported

An increasing trend was observed in publication over time, with most published between 2010–2019.

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an observed trendno p-value reported

There was an observed trend in outcomes measured in the studies; older studies have focused on treatment components and more recent studies on case identification and referral.

also in 504 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.