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To determine the prevalence of occupational asthma (OA) and work-exacerbated asthma (WEA) among asthmatic patients diagnosed in Primary Health Care (PHC). To analyze the impact at PHC level caused by under-diagnosis and inappropriate referral of OA.A descriptive, cross-sectional multicenter study in patients aged between 16 and 64years diagnosed with asthma, according to their medical record; all...