In a large bowl, combine the eggs, milk, breadcrumbs, onion and salt. Crumble hamburger over mixture and mix well (mixture will be moist). Shape into a round loaf; place in a slow cooker. Cover and cook on low for 5-6 hours. In a small bowl, whisk the ketchup, brown sugar, mustard and Worcestershire sauce. Spoon over the meat loaf. Cook 15 minutes longer or until heated through. Let stand 10-15 minutes.
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