Fig. 4From: The top 100 most cited articles on bronchoscopy: a bibliometric analysisGeographical distribution of all articles. The map showed that most articles came from two regions: North America and Western Europe(Due to limited space, the national borders are not completely accurate. This figure was modified based on an original image downloaded from Wikimedia Commons https://upload.wikimedia.org/wikipedia/commons/e/e7/GDP_per_capita-worldmap-2006.svg)Back to article page