URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5057cc2c8b104b1d6d7bf59aa006c8c7https://doi.org/10.1136/bmjopen-2020-042792
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d969ff8115dc26d09b45e34442ee090ehttps://doi.org/10.1136/bmjopen-2020-039763