18 Earthquake struck LA area at 4:31 am. Jan 17; 1994 Leor J et al. N Engl J Med 1996; 334: 413-9
19 Stress & CHD: psychosocial risk factors National Heart Foundation of Australia. Bunker SJ. MJA 2003; 178:United States Preventive Service Task Force rating of evidence:A: good evidence of support (good quality positive reviews over null reviews)B: fair evidence of support (number of such reviews was small)C: poor evidence support (no clear preponderance of either positive or negative reviews
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