Migration of adult children and mental health of older parents 'left behind': An integrative review.

PLoS One · 2018 · PMC6197646 · PMID 30346972

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an increasing trendno p-value reported

There is an increasing trend in the flow of rural surplus labour to big cities due to an imbalance in economic development between rural and urban areas, exacerbated by globalization and urbanization.

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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.