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I think correspondance courses for clinical subjects has no value. You need to have practical knowledge.
Just for sake of putting some degree behind your name doing such kind of courses should de discouraged, because I feel students who opt for these kind of courses are in search of some shortcut way to present themself as specialist rather than they do it because of unavailability of proper courses.
Also there are good Emergency courses in South Africa.
You can go for one of them.