Stripping out periods (full stops) from references

I am submitting an article to one of the Nature journals and they ask that there are no periods after initials. So they suggest:

Smith J, Jones M Jr, Houghton L et al (1999) Future of health insurance. N Engl J Med 965:325–329

However, all my Zotero references have periods after initials - what is best way to remove these?

Many thanks
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