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http://www.mihombroycodo.com.mx/academia/las-barreras-percibidas-en-el-uso-de-la-ecografia-en-los-paises-en-desarrollo-perceived-barriers-in-the-use-of-ultrasound-in-developing-countries/
Las barreras percibidas en el uso de la ecografía en los países en desarrollo / Perceived barriers in the use of ultrasound in developing countries