Fig. 11From: Emerging trends and hotspot in gut–lung axis research from 2011 to 2021: a bibliometrics analysisTop 25 cited references with burst impact. The blue and white squares in each row on the right side of the figure correspond to the year. The red squares represent that the references were highly cited in a short period and the recent successive red squares represent that the references were highly cited in recent yearsBack to article page