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The paper says "...specialty and associate specialist (SAS) doctors (doctors who have completed specialist training but do not have a staff position)...".
That's not correct. Firstly while SAS doctors may have completed specialist training, they more often have not. Secondly, a permenent SAS doctor does have a "staff position" in ordinary language. If this is a reference to US-specific terminology then I suspect the problem is that there is no direct equivalent.