By Nicholson Paul J   Cullinan Paul   Burge Sherwood   in Clinical Medicine

ISSN:1470-2118|12|2|156-159

Royal College Of Physicians‎(2012)‎

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By Levy Mark L   Nicholson Paul J   in British Journal of General Practice

ISSN:1478-5242|54|507|731-733

Royal College of General Practitioners‎(2004)‎

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