Fig. 1. The explosion of PNI research in the 1990s is illustrated by the increased percentage of PNI original articles, rapid communications, and case reports relative to the total number of such studies published in Psychosomatic Medicine by decade. The majority of PNI studies were published in the 1990s, accounting for more than 66% of all the PNI studies published in Psychosomatic Medicine from 1939 to 2000.

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