Not a lot of coverage of this, from any media source I know of (note the date of publication):
Conclusions. We observed a robust correlation between higher levels of gun ownership and higher firearm homicide rates. Although we could not determine causation, we found that states with higher rates of gun ownership had disproportionately large numbers of deaths from firearm-related homicides. (Am J Public Health. Published online ahead of print September 12, 2013: e1–e8. doi:10.2105/AJPH.2013.301409)
Not that one would expect anything different. Guess that's why it was ignored.