Follow-up study of 232 patients with occupational asthma caused by western red cedar ( Thuja plicata)

A total of 232 patients with red cedar asthma diagnosed by inhalation provocation tests were observed an average of 4 years after the initial diagnosis. The status during the follow-up examination was as follows: 96 patients continued to work with red cedar, and 136 left the industry and had no furt...

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