الإتاحة: https://doi.org/10.1371/journal.pone.0188904Testhttps://ir.ymlib.yonsei.ac.kr/handle/22282913/161657Test
الإتاحة: https://doi.org/10.1371/journal.pone.0154537Testhttps://ir.ymlib.yonsei.ac.kr/handle/22282913/151745Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34132a56065b47338ca9b80734c10fc7Testhttps://researchonline.lshtm.ac.uk/id/eprint/2267036/1/pone.0134643.pdfTest