SMN2 and spinal muscular atrophy, type 1: First, we identified the top 30 keywords with significantly strong citation bursts in international publications; the top 5 keywords were 5q13, Werdnig Hoffmann disease, deletions, SMN gene, and molecular analysis, with corresponding strength indices of 35.21, 27.85, 54.91, 26.64, and 19.49, respectively (Fig. 5J).