Abstract
the Science Citation Index and found that Finland, Canada, Spain, and the United Kingdom were countries of some importance in this field. Spain was particularly productive in the area of the pulmonary manifestations of the human immunodeficiency virus and had strong output in the areas of cancer, apnea and sleep related breathing disorders, tuberculosis, and pneumonia. 6 Our own group recently analyzed respiratory medicine research through publications in the journal Archivos de Bronconeumologia and found that the areas of greatest activity were apnea and sleep related breathing disorders, and oncology. 4 A comparison between 3 decades (1970, 1980, and 1990) of the evolution of production in each subject area revealed that activity had increased in the areas of asthma, apnea and sleep related breathing disorders, tuberculosis, non-tuberculosis infections, oncology, circulation, the pleura, and interstitial diseases: those findings were similar to reports from other authors. 6
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