Fig. 1
From: Letters to the editor in response to studies of guns in the home and homicide and suicide
Cluster analysis dendrogram representing the co-occurrence of journal correspondence characteristics in letters to the editor regarding gun in the home articles (Panel 1) and articles on topics other than firearms (Panel 2). Note: The length of the bars, measured along the horizontal axis, connecting the themes represents the association among the themes, with shorter bars corresponding to greater similarity among clustered themes.