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British medical journal - Clinical research ed / British Medical Association.-- (1981) -  (1988) -.-- London ISSN 0267-0623   Full Text Free for subscribers of print - Free access URL https://www.bmj.com/archive Available since    1840 Full Text Free - Free access URL http://www.pubmedcentral.nih.gov/tocrender.fcgi?journal=182&action=archive Available since    1840