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Dyfyniad Arddull ChicagoSibbald, Barbara. US Health System Needs Major Overhaul: Academy. 2001.
Dyfyniad MLASibbald, Barbara. US Health System Needs Major Overhaul: Academy. 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.